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.The high alloy content in 9310 allows for heavy sections to be treated to result in high case hardness and high core strength and toughness. This material is useful without carburizing, yet carburizing produces a highly wear-resistant case. The material is vacuum degassed and is also available in consumable electrode vacuum remelting process.C158 minus proprietary source + molybdenum = 9310, a slightly stronger steel with lower quench rates to be come hard and less likely to become brittle than C158. C158 bolt breakages are the biggest failure point for the AR-15 bolt carrier group, and is the biggest reason why C158 is not widely used outside of the AR-15.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 used in AR-15 & M-16 style rifles. Bolt is magnetic particle inspected (MPI) for a uniform quality and ...Carpenter 158; The Faxon Blog and Podcast. Posted by Faxon Firearms Staff on May 12th 2016. Why 9310 Steel in an AR-15 / M16 Bolt? "9310 is not MIL-SPEC, it's better than MIL-SPEC" Last week Faxon announced the release of their GUNNER series of Modern Sporting Rifle bolt carrier groups. Its been a pleasure working on the car …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 ...Bolts are most usually made from Carpenter 158 steel, but 9310 is considered the premium material because it has a higher tensile strength. Bolts are heat-treated, and, that's a process that needs to be done correctly. We should be getting correct when we spend up for a higher-dollar part.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.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.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.This Toolcraft DLC Bolt Carrier Group comes complete with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than commonly used "mil-spec" Carpenter 158 steel. This tougher than mil-spec bolt, when paired with Toolcraft quality and the Ionbond DLC finish is quite likely the ultimate hard use bolt carrier group!Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel. Rifling: 1 Turn in 24" - Right Hand Twist. Stock: Luth-AR Buttstock with adjustable buttplate & cheekrest. Forend: Windham Weaponry 13" Free-Floating Railed Handguard.- 9310 Steel can likely be deemed a quality and acceptable alternative to Carpenter 158 as the average properties when Heat Treated properly are similar. -8620 Steel is a VERY poor choice as an alternate and will both prematurely wear due to lower hardness and will likely fail within a relatively short period due to the significantly lower ...What is the difference between Carpenter 158 and 9310 steel? Carpenter 158 is the military specification (mil-spec) for bolts. 9310 is a more modern steel which can be up to 8% stronger than Carpenter 158. They are both premium steels with a long and successful history of use in AR15 bolts. Either will serve you well!The NBS .223/5.56 DLC 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 drop this ...Description. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Mil-Spec Carpenter 158® steel, shot peened for increased strength per Mil-Spec. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Complete Mil-Spec Bolt includes: Mil-Spec Carpenter 158® steel bolt Shot Peened for Increased Strength per ...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 15Carpenter 158® Nickel Alloys. Inconel® 718 AMS 5662 ... 9310 VAR AMS 6265 alloy steel from Rockwell is a low alloy carburizing steel known for its hardenability and strength. 9310 VAR also possesses solid ductility, weldability, and machinability properties. Stock sizes: 1.000" to 12.000" diameter.Jun 18, 2017 · Lugs were a little more beefy, made from 9310 Vac Arc steel. Seemed to be a little more rugged looking than your standard mil. spec. bolt made from Carpenter 158. A few other minor differences. I have never installed or run this bolt before and was curious if anyone else has had any experience with bolts made from 9310 Vac Arc steel?Mar 5, 2010 · Carpenter 158 is just ANSI P6 steel. Perhaps look for a P6 supplier instead? Personally if I was making a new AR-15 bolt I'd go with S7 should handle the stresses of the firing cycle alittle better. But probably also more expensive. Other then BCM and DD I don't think anyone else (except for Colt) makes them using Carpenter 158 anyways.SONS OF LIBERTY BOLT CARRIER GROUP: Best Bolt Carrier in the industry! Bolt: Precision machined from Carpenter Technology No. 158 chrome-nickel alloy. Heat treated per mil-spec, Shot peened per ASTM B851/SAE AMS2430S, Vibratory tumbled. Individual high pressure/proof (HP) test. Full Auto test fired at assembly.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 Insider Trading Activity of CARPENTER ROBERT J on Markets Insider. Indices Commodities Currencies Stocks5.56 Bolt is machined from Carpenter 158 tool steel; Shot peened; HPT tested/MPI marked; Black o-ring insert on extractor ... Nickel Bolt Carrier Group: No Aero 'A' Logo; Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations; Shrouded firing pin; Nickel Boron Coating inside and out (Bolt, Carrier ...The bolt is constructed from magnetic particle inspected Carpenter 158 steel, known for its strength and reliability. The carrier is crafted from aircraft-quality 8620 steel and features the M16 cut. It includes a gas key secured by properly staked grade 8 screws for enhanced reliability. The gas key is built from 4130 steel to withstand the ...Nov 15, 2023 ... ... 9310 Steel. Carpenter 158 is available for an additional charge.  Finish: All Bolt components Shot Peened and Manganese Phosphate or ...Now the bolts, they are made with AISI 9310 Steel, 9310 is better suited for an application such as a M16 bolt. 9310 is a steel typically used for gears, cams and things of that nature while Carpenter 158 or P6 tool steel is a plastic injection mold steel. 9310 is easier to machine and is more dimensionally stable in the heat treat process, this equates to better made parts.*The extractors are ...Steel Dynamics News: This is the News-site for the company Steel Dynamics on Markets Insider Indices Commodities Currencies StocksThis is our standard Nickel Boron Coated Bolt Carrier Group for the 5.56./.223 caliber. We use a 9310 Vac-Arc steel Bolt over the Mil-Spec Carpenter 158 Bolt because it's stronger and after many test firings and torture tests we've found it to not only last longer but to be more durable. The Nickel Boron coating has a Rockwell hardness between ...The most common is Carpenter 158 or C-158 steel, and the second most popular is 9310 steel. The exact difference between them is a lot of scientific talk but the easy version is that 9310-steel is about 7% stronger than C-158 when heat treated correctly. However, C-158 is Mil-Spec. Why is C-138 Mil-Spec if there is something better out there?9310 Alloy Steel (also known as AISI 9310 steel) is a low alloy steel composed primarily of nickel and chromium. It shows high hardenability, high core hardness and high fatigue strength. 9310 also possesses solid ductility, weldability, and machinability properties, and is an excellent metal for use in heavy-duty machinery, case hardened components, and gears.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Remember Me? What's New? Forum; FAQ; Forum ActionsBetter Bolt metal 9310 Steel or Carpenter 158 AR15 COM. The market demands 4150 because it is believes to be so much better than 4140 when in actuality they are nearly identical 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 nickelBolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16″ Chrome Lined with Yankee Hill Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel ... Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel. Rifling: 1 in 10″ - Right Hand Twist. Stock: Magpul CTR Carbine Stock with Magpul ...Material: 8620 steel, coated Gas key: hardened billet 4140 machined, coated Gas Key Screws: Grade 8 properly staked (heavy strike) Coating: Ion Bond (DLC Tribo-41) coating 1,4. Bolt Subassembly: Material: Carpenter No. 158 Alloy Steel, Shot Peened MPI: Yes, MPI Inspected 2 Extractor: 4140 Heat Treated & Shot Peened O-Ring: Mil-Spec materialFirearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Both SAE-AISI 9310 steel and SAE-AISI H13 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. For each property being compared, the top bar is SAE-AISI ...Jul 20, 2014 · Members. 550. LocationCalifornia. Posted July 20, 2014. I have been partial to the Carpenter 158 material for bolts but, there are quite a few available in 9310. I know 9310 alloy steel is very strong (they make differential ring and pinion gears for professional class drag racing cars. from it!) but on the M16/M4 the mil-spec is C158 - what is ...Carpenter 158 comes from one place, and one place only, Carpenter Technology of Reading PA. AISI 9310 steel can be sourced from any number of foundries, Carpenter being one of them. Needless to say, 9310 is more easily obtainable. Posted: 12/16/2016 12:41:00 AM EDT. [#5]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.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 …Better Bolt metal 9310 Steel or Carpenter 158 AR15 COM. The market demands 4150 because it is believes to be so much better than 4140 when in actuality they are nearly identical 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 nickel9310 or Carpenter 158 (C158) Steel: Bolt Finish: Black Nitride: Caliber.223 | 5.56 NATO | 300 Blackout: Extractor O-ring: Viton; Mil Spec: Carrier Material: 8620 Steel, Toolcraft Proprietary: Carrier Finish: …The Insider Trading Activity of CARPENTER ROBERT J on Markets Insider. Indices Commodities Currencies StocksThe steel is then tempered at a lower temperature to improve its toughness and flexibility. SAE - AISI 9310 Machining: AISI 9310 can be machined using conventional methods, but it requires high cutting speeds and adequate coolant to avoid work hardening. Carbide tools are recommended due to the high hardness of the steel. SAE - AISI 9310 ...Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16″ Heavy Profile - Chrome-Lined with A2 Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium Steel. Rifling: 1 in 9″ - Right Hand Twist. Stock: 6-Position Telescoping Buttstock.This Toolcraft DLC Bolt Carrier Group comes complete with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than commonly used "mil-spec" Carpenter 158 steel. ... See also the Carpenter 158 bolt version here: Toolcraft DLC BCG C158 Bolt 556 This is a 223/5.56/300 Blackout bolt carrier group. This BCG will not work with 6.5/6.8/308 etc.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.On the other hand, Carpenter 158 steel is chosen for its toughness, shock resistance, and fatigue strength. As such, it sees use in firearm components, gears, shafts, and general machinery. What Is the Difference Between 9310 Steel and 8620 Steel? 9310 steel and 8620 steel are low-alloy steels with some key differences between them.Apr 10, 2024 · 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.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...Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16" Heavy Profile, Chrome Lined with A2 Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps. Rifling: 1 Turn in 9" - Right Hand Twist. Stock: A2 Standard Stock.9310 Steel bolt, M16-style bolt carrier group, MPI/HP tested; Gas key MIL-SPEC sealed, torqued and staked ... M16-style MIL-SPEC bolt carrier group and HPT/MPI-tested bolt made from Carpenter 158; Mid-length gas system with H buffer and pinned gas block ... this accuracy would start to suffer but given that the FN Guardian uses a fairly durable ...Better Bolt metal 9310 Steel or Carpenter 158 AR15 COM. The market demands 4150 because it is believes to be so much better than 4140 when in actuality they are nearly identical 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 …Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 11-14-13, 18:32 #11. Mr blasty. View Profile View Forum Posts View Articles Member Join Date Jun 2010 Location MN Posts 947 Feedback Score 6 …Material matters, and the Carpenter 158 steel of the standard Mil-spec bolt is suboptimal for such a high-load application leading to a life expectancy of only about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds while cracking at the cam pin hole ...Heat Treatment of steel grade SAE 9310 . Heat treated : 1657°C - 1767°C. Technological Curves of steel grade SAE 9310 . No Curve. Cross Reference Table (Equivalent Grade) of SAE 9310 . Grade Standard Country Application; SAE NVl(1541) SAE: USA: precipitation hardening: SAE NV2(1547) SAE: USA:Dec 10, 2013 · Wilson combat has a 9310 steel Bolt Carrier Group on sale for $98.57, which is something like $70 off regular price. The three main BCGs I am looking at right now: PSA premium 158 Carpenter - was on sale for $109 when I put my order in Rainier Arms 158 Carpenter - on sale for $119 Wilson combat 9310 steel - on sale for $98.57.Carpenter 158 Vs. 9310. 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. ... difficult to machine and extremely temperamental in behaviour. The steel industry has advanced since the specification of Carpenter 158 but the basic ...For a free quote or To find out more about 9310 Alloy Steel, Call us on 714-632-0140. Contact Us. Friend Metals offer 9310 alloy bar with AMS 6265 specifications. Explore our forging options for high-quality alloys. Visit our website for more details.8740 steel firing pin with hard chrome finish. Magnetic particle inspected. Proudly made in the U.S.A. 6.5 Grendel Nitride Bolt Carrier Group (Type II) BCG Nitride 6.5 Grendel (Type II) Bolt Carrier Group (BCG) Product Specs: 6.5 Grendel Salt bath nitride finish M16 cut 9310 steel carrier Carpenter 158 steel bolt 4140 steel extractor MIL-SPEC O-ri.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.4 days ago · This bolt carrier group is high pressure tested as well as magnetic particle inspected, and it’s shot peened for added durability. The bolt is Carpenter 158 steel and the carrier is 8620 steel. And it has a Mil-Spec phosphate, matte black finish. The BCG has a shrouded firing pin and works in both full-auto M16s and semi-auto AR-15s.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 ...This BCG features a C158 bolt, 4340 extractors, and an S7 tool steel ejector. The gas key is made out of 4130 steel, is chrome lined as it should be, and includes enhanced Sprinco extractor springs, a sealed gas key, and properly staked gas key screws. The carrier is made out of 8620 steel and has a phosphate finish with a chrome-lined bore.7.62 x 39 Complete Bolt Carrier Group Made in the USA Black Nitride Finish Made from Bolt 9310 Steel and Carrier 8620 Steel Works with AR15 Milspec Uppers $139.95. Add to Cart ... LOSOK CUSTOM ARMS .308 BOLT CARRIER GROUP For AR-10/LR-308 rifles 158 Carpenter Steel Bolt with Nickel Boron Finish 8620 Steel Carrier with Black Phosphate Finish ...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 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 ...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.8740 steel firing pin with hard chrome finish. Magnetic particle inspected. Proudly made in the U.S.A. 6.5 Grendel Nitride Bolt Carrier Group (Type II) BCG Nitride 6.5 Grendel (Type II) Bolt Carrier Group (BCG) Product Specs: 6.5 Grendel Salt bath nitride finish M16 cut 9310 steel carrier Carpenter 158 steel bolt 4140 steel extractor MIL-SPEC O-ri.We also offer the Toolcraft DLC BCG with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than even Carpenter 158 steel. Above: SpiceTac specifies MIL SPEC Carpenter 158 steel for the bolts in our Diamond DLC BCGs. Even great bolt steels like 9310 and C-158 won't overcome one weakness that the AR-15 has shown over the years as it ...Chemical Composition. One of the biggest differences between 309 and 316 stainless steel is their chemical composition. 309 stainless steel contains 22% chromium and 12% nickel, while 316 stainless steel contains 16% chromium, 10% nickel, and 2% molybdenum. Adding molybdenum sets 316 apart from 309, further increasing its corrosion resistance.Mar 8, 2020 · 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.""Customers want modern designs, but the traditional stores do not offer that variety" The way Indians buy furniture seems to be changing. Until a few years ago, most would either c...We are a global leader in high-performance specialty alloy-based materials and process solutions for critical applications in the aerospace, transportation, defense, energy, industrial, medical, and consumer electronics markets. Safety. As our top value, we're proud to create a culture of safety in everything we do.9310 steel vs 158 carpenter. 9310 steel vs 158 carpenter. Posted on October 16, 2023 05:10:01 AM | Views: 628This BCG features a C158 bolt, 4340 extractors, and an S7 tool steel ejector. The gas key is made out of 4130 steel, is chrome lined as it should be, and includes enhanced Sprinco extractor springs, a sealed gas key, and properly staked gas key screws. The carrier is made out of 8620 steel and has a phosphate finish with a chrome-lined bore.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 used in AR-15 & M-16 style rifles. Bolt is magnetic particle inspected (MPI) for a uniform quality and ...9310 and 158 have very similar chemical makeup. Their yield and tensile strength are almost identical. Nitride or melonite will not make it stronger. It will give it a harder surface for wear. Craig. Posted: 10/31/2015 9:47:51 PM EDT. [#2] 158 bolts are also nitride/melonited.It also exhibits good strength, high toughness, hardenability, core strength, and very high fatigue strength. When annealed, 9310 has good ductility, machinability, and cold working properties. Additionally, 9310 is easily welded. It is typically used in gears, crankshafts, heavy-duty gears, the automotive, trucking, and aerospace industries.The first data sheet that mentions C-158 (or Carpenter No. 158) came out in 1981. They have no data that it existed before this date- at least not that they can find. IF, that is true, that would lead to believing that 8620 was the standard before this alloy was available (which is what many believe).Aermet 100 (Carpenter Technology Corporation), Ferrium C61 , I think 9310 has more molybdenum and C-158 and P-6 machine steel is the same and has more nicke, Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 11-14-1, Firearm Discussion and Resources from AR-15, AK-47, Handguns, - 9310 Steel can likely be deemed a quality and acceptable alternative to Carpenter 158 as the average properties, Carpenter 158; The Faxon Blog and Podcast. Posted by Faxon Firearms Staff on May 12th 2016. Why 9310 Steel , Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminu, 9310 steel carrier; Carpenter 158 steel bolt; 4140 steel extractor;, Apr 29, 2017 · In contrast to this, LWD doesn't sell bulk steel,, Jan 6, 2014 · Carpenter 158 is a case (surface) hardened steel wher, Quoted: As I understand it, Carpenter 158 is a case (, Bet it is cheaper too. This, c158 has to be purchased in massive qu, Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Pri, Carpenter 158 is 9310 with case hardening. Forgot to mention that, For material, Carpenter 158/C-158 is great and practically a standard, The original specification calls for this part to be mac, Apr 21, 2020 ... BCG Specifications: https://studio.youtube.com/vi, The carrier is usually made of 8620 steel, but the bolt (wh.