9310 steel vs carpenter 158

"Straw man arguments" are utilized in debates to undermine the opposition. If you want to take the high road–and debate more effectively in the process–utilize the "steel man" argu...

Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Cowen & Co. has decided to maintain its Outperform rating of Carpenter Tech (NYSE:CRS) and raise its price target from $50.00 to $54.00. Share... Cowen & Co. has decided to mai...Carpenter 158, on the other hand, contains a high percentage of carbon, which makes it incredibly hard and strong. Additionally, Carpenter 158 has a higher tensile strength and yield strength than 8620 tool steel, which means it can handle heavier loads and higher stress. Another important factor to consider when comparing these two tool steels ...Apr 29, 2017 · In contrast to this, LWD doesn't sell bulk steel, it sells products expected to perform beyond mil-spec requirements. But Carpenter cares little or nothing about whether bolts made from 158 steel break prematurely or not. Carpenter has never made or even tested a single bolt, and doesn't warranty any of the bolts manufactured using it's 158 steel.Raise your children like a gardener—not a carpenter. My oldest daughter turns 10 this month. I say this with disbelief, as I am under the mistaken impression that I am still new to...semi_cop. I think 9310 has more molybdenum and C-158 and P-6 machine steel is the same and has more nickel and chrome. I think C-158 has to be bought in larger bulk quantities than 9310 which has also led to more 9310 offerings. From what I understand if done right 9310 is more durable. I think all my bolts are 9310 except one in a COLT 5.56 gun.Carpenter 158, on the other hand, contains a high percentage of carbon, which makes it incredibly hard and strong. Additionally, Carpenter 158 has a higher tensile strength and yield strength than 8620 tool steel, which means it can handle heavier loads and higher stress. Another important factor to consider when comparing these two tool steels ...

Apparently the 1b1b6 has a "158 Carpenter Steel bolt", opposed to a "AISI 9310 alloy steel" Bolt on the Nitrided one I'm looking at. Is one superior to the other, or a matter of preference? ... Bolts available in 9310 Steel or Carpenter 158. Obviously, Toolcraft will make whatever the customer wants. They might use different steels and do ...C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy comp.Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. ... Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel. Rifling: 1 in 10″ - Right Hand Twist. Stock: Magpul CTR Carbine Stock with Magpul ASAP QD Single Point Receiver End Plate.C158 is supposed to technically be stronger than 9310, but many higher end BCG makers are now using 9310 instead of C158 for their bolts b/c they say 158 is antiquated and they have figured out how to make 9310 better than "mil-spec." Faxon uses 9310 in their bolts and so does Noveske. Aero precision and Brownells, which are more budget ...Carpenter Technologies' 158 blend of steel was selected as it provided adequate strength and wear characteristics. It has been the "Mil-Spec" since. Since the creation of Carpenter 158, the metals industry has continued to innovate, creating new blends of steels. 9310 is a AISI standard grade of tool steel that makes it about ~7% stronger than ...0. C158, 8620, 9310 BCG Steel. These are the (3) most common BCG steels being used in today's AR/M4 industry (from what I read about). I know just a little bit about metallurgy, but, not enough to distinguish what comes into play when each steel is used for BCG's. My (2) AR's use 9310 steel for the BCG's.Toughness of over 200 ft./lb. Charpy C-Notch. HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310. Mil-Spec Extractor and Ejector Springs, Gas Rings. While the two bolts have identical construction, the two coatings vary slightly.The decision depends largely on the specific requirements of your application. For applications that require excellent toughness, wear resistance, and uniform hardness, 9310 steel bolts are a great option. For applications that require high strength, durability, and resistance to thermal shocks, C158 bolts are the ideal choice.

Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. ... Barrel Material: 4150M Chrome Moly Vanadium 11595E Steel. Rifling: 1 Turn in 10" - Right Hand Twist - 6 Lands & Grooves. Stock: 6 Position Telescoping Buttstock with Windham Weaponry Logo. Forend: Windham Weaponry 15″ MLOK Free-Float Handguard.I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? Carpenter 158 Vs. 9310 - Page 11Carpenter 158 is steel from the 60's, literally. Does not a 'best' BCG make. The carrier itself however, almost irrelevant. Reply reply 1000stomachcrunches • thanks for the info, his comment had me off on a hunt to learn more about 9310, didnt think to check if 158 is actually the best. Im normally more of a skeptic too. Reply reply ...at some point, it is how many angels can dance on the head of a pin. 9310 is a standard. Carpenter 158 is proprietary alloy, and no real difference from 9310 in effective use of weaponry in a bolt. The difference between C-158 and 9310, I just don't see it. There is no evidence, let alone testing differences to the practical extent that it matters.9310 steel bolts have had a measurable reduction in bolt lug shearing vs C158 in the Grendel platform and is why its usage is almost universal in that role. In high bolt thrust applications, it has been the best option for steel bolts. ... by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are ...Toolcraft BCGs are generally available with bolts made from either 9310 or Carpenter 158 steel. They are batch High Pressure Tested (HPT) and every bolt is Magnetic Particle Inspected (MPI). Markings on the bolts vary with some being marked MP or MPI and some being marked 9310 or C158. It is more common though for the bolts to not be marked in ...

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What is the difference between a 158 carpenter bolt and one made from 9310 steel? The difference is in the steel. Many manufacturers will state that properly heat treated 9310 is approximately 7-8% "stronger" than 158, but 9310 requires that it be heat treated properly to achieve that increase in strength.A little more expensive, but easier to heat treat with little if any distortion. You can get 55 c scale with S-7 air quench. The other two have to be done in a carbon gas atmosphere . S-7 has a higher shock rating, but slightly less in the wear and abrasion than 9310 or 158.Difference Between 9310 Tool Steel and Carpenter Steel Strengths and Weaknesses of Both Steel Types. While 9310 Tool Steel and Carpenter Steel have exceptional properties, they also have weaknesses. 9310 Tool Steel is known to be brittle at room temperature, while Carpenter Steel has a lower resistance to corrosion and oxidation.140-280. 1.20. Zr-0.0C1%Hf (Grade 21) Zircaloy 2 (Grade 32) Zircaloy 4 (Grade 34) Have a look at our machinability rating graph which without a doubt will make your decision a lot easier with its incredibly detailed information.

Business, Economics, and Finance. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. CryptoI would assume that 9310 has the potential to be heat treated, stress relieved, hardened, shot peened, etc into a good 5.56 bolt. But it would be folly to overlook the truly massive amount of research that has gone into the Carpenter 158 bolt we have now.Good for Indiana, bad for Michigan. There will be winners and losers from Donald Trump’s recently announced tariffs on steel and aluminum imports. A disproportionately large number...M-50 VIM-VAR is a premium-melted alloy exhibiting excellent resistance to multi-axial stresses, resistance to softening at high service temperatures and good resistance to oxidation. Characteristic of a high-speed tool steel, it possesses high compressive strength. All M-50 at Sullivan is melted in the USA. Domestic Source and DFARS Approved. FOR REQUIREMENTS: High Temperature Steel, AircraftASTM A646 (9310-2) SAE J1397 (9310) SAE J404 (9310) AISI E9310 Uses. One of the main applications of AISI E9310 is manufacturing aircraft components, including gears, shafts, and bolts. The alloy is also used in high-stress applications, such as heavy-duty machinery, oil and gas drilling equipment, and racing engines.Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. ... Barrel Material: 4150M Chrome Moly Vanadium 11595E Steel. Rifling: 1 Turn in 10" - Right Hand Twist - 6 Lands & Grooves. Stock: 6 Position Telescoping Buttstock with Windham Weaponry Logo. Forend: Windham Weaponry 15″ MLOK Free-Float Handguard.Carpenter 158 Vs. 9310; If this is your first visit, be sure to check out the FAQ by clicking the link above. ... But Carpenter cares little or nothing about whether bolts made from 158 steel break prematurely or not. Carpenter has never made or even tested a single bolt, and doesn't warranty any of the bolts manufactured using it's 158 steel ...Bren. 79807 posts · Joined 2005. #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that. The left are a coalition of ...Another difference is the strength and toughness levels of the alloys. 8620 and 9310 have good toughness, which means they can withstand high-stress levels without breaking. However, the tensile strength of 9310 steel is significantly higher than that of 8620 steel. This makes 9310 steel ideal for parts requiring strength and durability.

Brownells 9310 vs PSA H&R C158 BCG for 607 build I hate not knowing, doing my research, and realizing how confused I am, and knowing much less than I thought - which one boys & girls? Locked post. New comments cannot be posted. Share Add a Comment. Be the first to comment Nobody's responded to this post yet. ...

Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength with a yield point of approximately 135 ksi (931 MPa). These high mechanical properties are developed in sections up to 5" (127 mm) thick, making Carpenter 158 a consideration for use in very large parts requiring maximum strength, wear ...Conclusion. Choosing between 9310 Tool Steel and Carpenter Steel can be challenging. However, understanding the strengths and weaknesses of each steel type …Aug 21, 2019 · Bren. 79807 posts · Joined 2005. #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that. The left are a coalition of ...This is significantly stronger than the Carpenter 158 steel called out by the military and vastly superior to many materials used in civilian bolt production. What is S7 Tool Steel? a. The S-Type tool steel is specifically designed to resist the effects of shock at both high and low temperatures. What happens if I break your Relia-Bolt? a.Machining DataSheet for Steel 9310 (14NiCrMo134) Machining DataSheet for. Steel 9310 (14NiCrMo134) Steel 9310 Menu: Equivalent Standards. Chemical Composition. Cutting Speeds Recommendation. Recommended Carbide Grades. Cutting Edge Geometry.Catastrophic NiB 9310 bolt failure. One part of a Mil-Spec bolt is that it is made from Carpenter 158 steel, but a more prevalent bolt material on the market is 9310 steel. This is sought after due to its lower cost and in a normal market, plentiful abundance. The downside of 9310 steel is that is has to be properly heated treated when used for ...However by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties. ... difficult to machine and extremely temperamental in behaviour. The steel industry has advanced since the specification of Carpenter 158 but the basic premises ...Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.

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Bren. 79807 posts · Joined 2005. #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that. The left are a coalition of ...All Toolcraft BCG bolts are shot-peened, MPI and batch HPT to ensure quality and reliability. Made from either mil-spec Carpenter 158 steel or high strength 9310 steel, bolt carrier groups from Toolcraft are guaranteed to perform like new for thousands and thousands of rounds. You cannot buy a better bolt carrier group than a Toolcraft.Wilson combat 9310 steel - on sale for $98.57. BCGs are coming down in price and I want to buy a couple of good quality ones while prices are good. I have a Palmetto State Armory premium 158 Carpenter steel bolt carrier group on the way, I ordered it last week for $109. The other BCG I was looking at was the Rainier Arms for …All Toolcraft BCG bolts are shot-peened, MPI and batch HPT to ensure quality and reliability. Made from either mil-spec Carpenter 158 steel or high strength 9310 steel, bolt carrier groups from Toolcraft are guaranteed to perform like new for thousands and thousands of rounds. You cannot buy a better bolt carrier group than a Toolcraft.Simple, 9310 is an AISI standard grade tool steel which, when properly treated, actually makes it about 7% stronger than "mil-spec" Carpenter 158. The proof is in the numbers. The carrier material, 8620 is used for various aircraft and vehicular applications, has a superior toughness rating, and features solid overall strength properties.Perhaps this is the wrong outlet to make this question, but can anyone tell me the difference in reliability and longevity between a bolt made from 9310 steel and Carpenter 158 steel? Does one resist shearing better but is more brittle, I assume something along those lines is the difference.Carpenter No. 158 Bolt Steel. Carpenter No. 158 steel is the mil-spec steel used for fabricating the bolt itself. This type of steel is more expensive than 9310 (another popular steel used for the bolt and carrier), but it provides the best performance and lifespan for the BCG.© MelissaMN - stock.adobe.com When the Gothic Revival movement emerged in Europe, the buildings constructed displayed the same carved stone features as Expert Advice On Improving Y... ….

Bolts available in 9310 Steel or Carpenter 158 Our products carry a lifetime warranty. Simply put Should any of our products fail, return it to us for a brand new replacement. Posted: 1/1/2020 3:57:10 PM EDT [#18] As long as the bolt isn't 8620, the carrier is usually made from this but after Sandy Hook a lot of shady fly-by-night manufacturers ...9310 VAR AMS 6265; 4340 VAR AMS 6414; Aermet® 100 AMS 6532; ... CBS-50 NiL® AMS 6278; Carpenter 158® ... Pyrowear® 53 is a double vacuum melted premium alloy steel. It is a carburizing gear steel and exhibits a strong fatigue resistance, toughness and deep hardenability. ...Carbon steels: 1015: 72%: 1018: 78%: 1020: 72%: 1022: 78%: 1030: 70%: 1040: 64%: 1042: 64%: 1050: 54%: 1095: 42%: 1117: 91%: 1137: 72%: 1141: 70%: 1141 annealed: 81% ...Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16″ Superlight with Melonite QPQ Finish and A2 Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel with M4 Feed Ramps. Rifling: 1 in 9″ - Right Hand Twist.LESCALLOY 9310 VAC-ARC steel has machinability rating of 40% of B1112 steel. FORMS AVAILABLE Billets; hot rolled bars, cold drawn and centerless ground bars; forgings. APPLICATIONS Aircraft Engine Gears and Pinions HEAT TREATMENT Annealing: Heat uniformly to 1475-1575°F (802-857°C), furnace cool. Normalizing: Heat uniformly to 1650 …This .308 AR-10 Full Auto Bolt Carrier Group is another precision quality part from Wilson Combat. The bolt is machined Carpenter 158 hardened steel to prevent wear and tear while still remaining flexible enough to prevent cracking. Featuring a Nickel Boron finish on the outside and chrome lined gas key inside, this bolt carrier group will work ..."C158 vs 9130 bolt material" "Carpenter 158 9130 m16 bolt" "C158 9130 superior bolt material" Something along those lines... Someone please help me find this document as I believe that it's important info for the AR community to know. There are so many 9130 vs C158 threads and this could be the document that ends all of the arguments.A little more expensive, but easier to heat treat with little if any distortion. You can get 55 c scale with S-7 air quench. The other two have to be done in a carbon gas atmosphere . S-7 has a higher shock rating, but slightly less in the wear and abrasion than 9310 or 158. 9310 steel vs carpenter 158, (RTTNews) - Below are the earnings highlights for Carpenter Technology Corp. (CRS): Earnings: $6.2 million in Q2 vs. -$29.4 million in the same p... (RTTNews) - Below are the earn..., Both SAE-AISI 4140 steel and SAE-AISI 9310 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown. For each property being compared, the top bar is SAE-AISI 4140 ..., 9310 VAR AMS 6265 is a Chromium-Nickel-Molybdenum Alloy used as a Carburizing Grade for Aircraft Parts. Users can obtain high case hardness coupled with high core strength and toughness. High alloy content makes it suitable for use in relatively large cross-sections. Its combination of high alloy and low carbon content can achieve high …, Sep 6, 2023 · While 9310 Tool Steel and Carpenter Steel have exceptional properties, they also have weaknesses. 9310 Tool Steel is known to be brittle at room temperature, while Carpenter Steel has a lower resistance to corrosion and oxidation. If cost is a major consideration for your project, Carpenter Steel may be a more affordable option., May 18, 2023 ... 300BO M16 Profile MPI Inspected Bolt Carrier Groups features a Black Nitride finish, 8620 Steel Bolt Carrier, 9310 Steel ... carpenter-158-bolt- ..., Carpenter Technologies' 158 blend of steel was selected as it provided adequate strength and wear characteristics. It has been the "Mil-Spec" since. Since the creation of Carpenter 158, the metals industry has continued to innovate, creating new blends of steels. 9310 is a AISI standard grade of tool steel that makes it about ~7% stronger than ..., It is built to Mil-Spec standards that include a 9310 steel bolt assembly that is nitride treated for durability, a nitride treated 8620 steel carrier assembly, and a properly staked gas key (grade 8 fasteners). This 6.8 SPC BCG will work with all 6.8 SPC Type 2 applications. Fast & Free Shipping on Orders $99+ Top-Rated Customer Service ..., Stick with a C158 phosphate BCG from any reputable brand. If you want it to be slightly easier to clean then get a chrome one or an NP3 from Sionics. Avoid nitride ( especially if it comes with a 9310 bolt), NiB, TiN, and most other wiz-piss finishes. DLC isn't that bad but it's still not as good as a phosphate carrier with a chrome-lined bore. 3., Why 9310 Steel in an AR-15 / M16 Bolt? Why is 9310 Steel the superior option for your AR-15/M16 Bolt? Well, 9310 is actually around 7% stronger than Carpenter 158 and is better than "mil-spec." faxonfirearms.com. 9., While the Nickel Boron on the 9310 steel bolt was chosen for being easy to clean, having a low coefficient of friction, AND with the benefit of heat dissipation. ... Carpenter 158 steel bolt; Chrome-lined interior bolt carrier key and bolt carrier; Torqued and staked gas key screws; Coated with a matte black mil-spec finish;, Made from Mil-spec Carpenter 158 steel, this BCG is built to accommodate heavier grain cartridges, such as subsonic .300 AAC Blackout ammo. ... 8620, and 9310 heat-treated steel, the internals of this BCG guarantee durability. It's also coated with QPD nitride, providing excellent resistance to wear and corrosion. The adjustable titanium gas ..., Carpenter 158 9310 - MAY be harder than Carpenter 158 Nickel baron (easier to clean) Titanium BCG with an S7 bolt. Supposed to be three times more impact resistance than Carpenter 158 ... There has been an increase use in 9310 steel for bolts over C158. 9310 steel claims a slight advantage of toughness when properly heat treated which gives ..., There are many grades of steel wool on the market today. Check out this helpful article for details on the various uses for steel wool. Advertisement Advertisement Please copy/past..., MSRP: $139.99. Price: $119.00. — You save $20.99. Quantity: Add to Wish List. Description. Additional Information. This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is Carpenter 158, shot peened, HPT and MPI tested, and finished in a self-lubricating polished black ..., 0. C158, 8620, 9310 BCG Steel. These are the (3) most common BCG steels being used in today's AR/M4 industry (from what I read about). I know just a little bit about metallurgy, but, not enough to distinguish what comes into play when each steel is used for BCG's. My (2) AR's use 9310 steel for the BCG's., Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior?, Difference Between 9310 Tool Steel and Carpenter Steel Strengths and Weaknesses of Both Steel Types. While 9310 Tool Steel and Carpenter Steel have exceptional properties, they also have weaknesses. 9310 Tool Steel is known to be brittle at room temperature, while Carpenter Steel has a lower resistance to corrosion and oxidation., SKU 51655115274 Brand Palmetto State Armory Model Number 51655115274 UPC 51655115274 DETAILS Manufacturer: Toolcraft Caliber: 5.56/.223 Bolt Finish: Nitride Bolt Steel: Carpenter No. 158 Steel Profile: Full Auto Profile Gas Key: Grade 8 Hardened Fasteners, Staked per MilSpec FEATURES This Toolcraft Logo'd Nitride BCG is made with a carpenter 158 bolt with a full-auto profile, designed to be ..., Simply the best left-handed 5.56 NATO bolt carrier group on the market! Toolcraft 5.56 NATO Black Nitride Bolt Carrier Group is a Full-Auto M16 BCG manufactured using the finest U.S-sourced raw materials. The Black Nitride coating vastly increases the hardness of the steel, prevents corrosion, is highly resistant to wear, will not flake (it's ..., Choose from either the very popular 9310 steel or the mil-spec 158 Carpenter steel. Both are modern ultra-high strength steels designed specifically for applications where high strength and durability are of paramount importance. ... 9310 or Carpenter 158 Steel: Bolt Finish: Nickel Boron: Caliber: 223/5.56/300 Blackout: …, Business, Economics, and Finance. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. Crypto, The material composition, such as Carpenter 158 or 9310 steel, and the choice of coating, from phosphate to Diamond-Like Carbon (DLC), can significantly affect the BCG's performance. Whether you're building a new rifle or upgrading an existing one, understanding the implications of these choices is key to optimizing your AR-15's ..., This - $58.95. $60.95 was 9310 steel AO Precision Premium Phosphate Bolt Carrier Group - 158 HPT/MPI This mil-spec bolt carrier group goes through rigorous quality control tests before it's made available for purchase, including high pressure testing and magnetic particle inspection., 4140 Steel Cam Pin. 8740 Steel Firing Pin with Hard Chrome Finish. Magnetic Particle Inspected. Available in AR-15 and AR-308 sizes. Engraved In House. Proudly Made In The USA. Engraved AR Bolt Carrier Group (BCG) - Spartan M16 Cut 9310 Steel Carrier Carpenter 158 Steel Bolt 4140 Steel Extractor Mil-Spec O-Ring Mil-Spec Gas Rings 4., The steel used is properly hardened, but I don't think it's technically Carpenter 158. However, at under $170, an HPT and MPI-tested BCG is a great value. You should know that many would say ..., Tampa (Automotive) (OP) 4 Jun 10 12:57. Have issues with 8620 deep case carburized pins, spalling by bearing rollers and have tried 9310 with better results because of the higher core hardness but 9310 barely meets the hardness spec of 60/62 Rc (after finish grinding). Thinking about a tool steel with high toughness like A2 which would easily ..., One of the most significant differences between 9310 and 4140 steel is their chemical composition. 9310 steel is alloyed with nickel, chromium, and molybdenum, while 4140 steel contains chromium and molybdenum. Adding nickel in 9310 steel makes it more resistant to stress and fatigue, while the higher chromium content in 4140 steel improves ..., The NBS .223/5.56 Black Nitride Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know that you will have a dependable BCG, when you ..., Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 18" Fluted Medium Profile, Chrome Lined with A2 Flash Suppressor. Barrel Material: 4150M Chrome Moly Vanadium 11595E Steel. Rifling: 1 Turn in 10" - Right Hand Twist - 6 Lands & Grooves., Nov 5, 2013 ... I discuss the steel differences between carpenter 158 and 9310 from the AR Performance Super bolt. A new manufacturer of a "high quality ..., Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear., Carpenter 158 Steel also known as Cartech-158, C-158 mil spec steel is a case (surface) hardened steel where 8620 is through hardened. C-158 is very hard on the outside to prevent wear and crack formation while 8620 inside is softer and more flexible to prevent crack propagation and absorb shock loads. Few of applications for carpenter-158 ..., Aermet 100 (Carpenter Technology Corporation), Ferrium C61 and Ferrium C64 (QuesTek Innovations, LLC)) after a preliminary evaluation of a larger material matrix that had consisted of, in addition, CCS42L, LESCO53, 32CDV13 and XD15NW ferrous alloys. Pyrowear 675 is a high strength stainless steel designed for gear application. Aermet 100 is an