$1.77. $114.99. Join Our Mailing List Subscribe now to keep up with all the latest sales and news from Locked . More. Thanks for posting /u/theblackarmory! Colors. Coming Soon. Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride. Out of stock. Aero Precision Epc Bolt Carrier Group, Direct Blowback, 9mm, Nitride Finish, Black, Fits Ar9 Aprh101200c. $144.49. UTG PRO® M-LOK® Standard QD Sling Swivel Adaptor, Black. The barrel is arguably one of the most important components in your build. Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride APRH101200C. OUT OF STOCK FREE SHIPPING (0) Add To Cart. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. It will function reliably with a wide range of loads out of the . $174.99. The proprietary bolt carrier group and buffer make shooting a direct blowback carbine pretty pleasant. : 100044581 815835019796 100044581 . The Ruger has a two part bolt that is supposed to "flatten" recoil impulse. Description Reviews (0) DESCRIPTION. Pistol Caliber / Blowback - A pistol caliber or blowback BCG is one that is built to be used in an AR build chambered for a pistol caliber round such as 9mm or 45 ACP. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Add to Wish List Add to Compare. Sale Price: $264.99 . × Add Review. The Aero Precision EPC/AR9 Bolt is the core of . ADD TO WAIT LIST. Ergo Grip Ar15 . AERO PRECISION 9MM BOLT CARRIER GROUP DIRECT BLOWBACK - NITRIDE Our Price: $169.99 . The foundation of this product line is our forged EPC-9 receiver set, accepting . The Aero Precision EPC/AR9 Bolt is the core of your EPC build. $15.99. Construction of this assembly include both a carrier and bolt machined from 8620 tool steel with a nitride black finish. Notify me when this product is in stock. ADD TO WAIT LIST. Handguard . Add to Cart. The barrel is arguably one of the most important components in your build. 9mm Luger. Add To Cart. The Brigade Manufacturing BM9 semi-auto AR pistol chambered in 9mm is an affordable soft shooting direct blowback firearm with a 5.5" barrel that uses Glock magazines and has some special tricks up its sleeve. Buy Now; AR 10/M5 CTR® Carbine Stock - Mil-Spec, Gray $ 64.95 Add to cart. The bolt carrier group is compatible with most aftermarket fire control groups. New for 2020! 9mm Bolt Carrier Group, Direct Blowback - Nitride The Aero Precision EPC/AR9 Bolt is the core of your EPC build. We maintain the dual COLT/GLOCK compatible geometry, user-removable weight and full-auto compatibility while adding new and welcome features. Out of stock. .308 / 7.62 Bolt Carrier Group, Complete - Black Nitride $ 229.99 Add to cart; 9mm Bolt Carrier Group, Direct Blowback - Nitride $ 169.99 Add to cart; Aero Precision 5.56 Bolt Carrier Group, No Logo - Black Nitride $ 149.99 Add to cart; AR15 5.56 PRO Series Bolt Carrier Group - Black Nitride Sale! Rating: 100 % of 100. $144.99. $144.99. AERO PRECISION EPC-9 9MM LUGER BOLT CARRIER GROUP DIRECT BLOWBACK BLACK. Skip to the beginning of the images gallery. Savings: $20.00 (Out of Stock) AERO PRECISION EPC-9 . 9mm Bolt Carrier Group, Direct Blowback - Nitride $ 169.99. 9MM AR-15 Bolt Carrier Group - Colt / Glock MSRP: $149.99 SALE PRICE: $99.95 Notify Me CMMG MKG GUARD Radial Delayed Blowback 9MM BCG and 16" Barrel Combo MSRP: $424.95 SALE PRICE: $389.95 Notify Me CMMG MKG GUARD Radial Delayed Blowback 9MM BCG and 8" Barrel Combo MSRP: $374.95 SALE PRICE: $349.95 Notify Me Regular Price. Bolt Features: Machined from 8620 Steel Black Nitride Finish Bolt . In stock Purchase Now » View Details » Spikes ST5BG03 Bolt Carrier Group M16/AR15 223 Rem/5.56 NATO Nickel Boron Steel. A direct-impingement or short-stroke gas-piston system actuates it. In Stock. $169.99 $161.49. Add To Cart. $189.99 $175.99 Sale. "[Parts] Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride $189.99+ SH https://t.co/AU35BzhRZC https://t.co/v40HOpW9Zc" However, most 9mm pistol-caliber carbines and submachine guns use a blowback system, where the mass of the bolt and the tension of the recoil spring oppose the breech's opening. AERO PRECISION EPC-9 PISTOL COMPLETE LOWER RECEIVER WITH MOE GRIP AND NO STOCK Our Price: $284.99 . Model : UPC : 815421029437. Buy Now; AR 15 7.5″ 5.56 Pistol Length AR 15 Barrel, Modern Series $ 115.00 Add to cart. The MPX is the only one (that I know of) that has a completely non blowback system; short stroke gas piston. Also planned for 2021 are EPC models in .45 ACP and .40 S&W. All of these models will use Glock magazines because they are the most . aro-9mm-bcg-000. Notify Me. DESCRIPTION The Aero Precision EPC/AR9 Bolt is the core of your EPC build. ADD TO WAIT LIST. $169.99. r/GunDeals has updated the website blacklist, check it out before making your next purchase!. NBS 9mm Bolt Carrier Group - Black Nitride. Aero . Description: Aero Precision 9mm Direct Blowback Bolt Carrier Group, Nitride. Description. $114.99. Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group is one of the simplest purchases toward converting . Out of stock. In . The 9mm Ramped Bolt uses standard AR15 hammer. Construction of this assembly include both a carrier and bolt machined from 8620 tool steel with a nitride black finish. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of . SKU: AERO-APRH200060C MPN: APRH200060C. The Aero Precision EPC-9 9mm Bolt Carrier Group is machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. Your Price: $114.99. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. AERO PRECISION 9mm Bolt Carrier Group, Direct Blowback - Nitride The Aero Precision EPC/AR9 Bolt is the core of your EPC build. UTG PRO® M-LOK® Standard QD Sling Swivel Adaptor, Black. Out of stock View Details » View Details » Filter By . AERO - EPC 9mm Bolt Carrier Group, Direct Blowback - Nitride $ 169.99. Rating * Name * Email * Review Subject * Comments $229.95. Quick Overview . The Aero Precision EPC-9 9mm Bolt Carrier Group is machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. In Stock . The BM9 uses tough forged 7075-T6 aluminum AR upper and lower receivers that were manufactured in-house by Brigade and uses a weighted 9mm bolt carrier group and heavy buffer to reduce . Write a Review. 49 . Out of stock. Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. The blowback operation of the 9mm AR-15 drives a very heavy bolt (normally 16 ounces) much harder than a standard AR-15 BCG. Quick View . REFURBISH DENT OR SCRATCH $113.14 . Out of stock. Add To Cart. AERO - AR15 ATLAS S-ONE M-LOK Handguard 10.3″ Anodized Black $ 152.99. $169.99 $119.99. View Details. Email. It (the rifle) is pretty heavy, and that also reduces recoil. Please add to cart for sale price . CMMG AR-15 BARREL & BOLT CARRIER GROUP SETS 9MM CMMG AR-15 5 BARREL & BCG SET 9MM . Quick Overview . This BCG also has a Grade 23 titanium firing pin and has its bolt guides and extractor made of . Federal. Add to Wish List Compare Product. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. 9mm EPC Bolt Carrier Group, Direct Blowback - Nitride - APRH200060C. Your Price: $214.78. 6 min. Worn Aero Aprh100070 5.56 BCG Nickl Boron. Related Items; Accessories; Recently Viewed Items; Quick View . EPC Recievers. Notify me when this product is in stock. Notorious Performance Aero Precision's reputation for quality continues with this BCG. View All Close. The Aero Precision EPC/AR9 Bolt will be the core of your EPC build. 9mm Bolt Carrier Group, Direct Blowback - Nitride Out of stock $169.99 Thinking of building a 9mm AR Carbine? For 9mm bolt carriers, the bolt head is flat and is critical in creating a seal on the blow-back design of AR-15 9mm Pistol Caliber Carbines. aro-9mm-bcg-000. Customers Also Viewed. Magpul PMAG . Save 8 % MSRP: $ 119.95 $ 109.95. 0 Reviews. AERO PRECISION 9MM BOLT CARRIER GROUP DIRECT BLOWBACK - NITRIDE $169.95 AERO PRECISION 9MM BOLT CARRIER GROUP DIRECT BLOWBACK - NITRIDE AERO PRECISION (No reviews yet) Write a Review Quantity: Description Info DESCRIPTION The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Name: * Email: * Location: * Title: * Review: * Close Add Review. Skip to the end of the images gallery. This 9mm bolt carrier group BCG is one that may have been created for the competitive shooter in mind. Add to cart. Retail Stock. AERO - AR15 BREACH Ambi Charging Handle w/ Large Lever - Black $ 79.99. SKU: APRH101200C Category: BOLT CARRIER GROUP Tag: BCG. Out of stock. In stock Purchase Now » View Details » Aero Precision 8.3" 9mm CMV Barrel w/ 9mm Black Nitride BCG Bundle - APSL100339. Store Price Shipping rate Show more; Brownells. The Bolt Carrier Group also has a removable weight . For 9mm bolt carriers, the bolt head is flat and is critical in creating a seal on the blow-back design of AR-15 9mm Pistol Caliber Carbines. Online Only. 1 Review Write A Review. [PARTS] 9mm Bolt Carrier Group, Direct Blowback - Nitride $169. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Financing Available. Cartridge: 9 mm Luger. AERO PRECISION EPC-9 9MM LUGER BOLT CARRIER GROUP. This was made to handle pretty much all kinds of multiple firing episodes. Sort By: 2 Item(s) Show. Add To Cart. The Aero Precision 9mm PCC Bolt Carrier Group in black nitride weighs in at 15 oz. For example, the Faxon Firearms 9mm Black Nitride Bolt Carrier Group is shaped quite differently than a standard AR-15 or M16 style BCG. About this BCG: This BCG is an AR-15 compatible design, allowing use with 9mm Luger (9x19) cartridges. Aero Precision 9mm EPC Bolt Carrier Group, Direct Blowback - Nitride (C) SKU : APRH101200C. MSRP: $169.99 | Your Price: $144.49. AR-15 Bolt Carrier Groups; Aero 9mm Bolt Carrier Group - Direct Blowback, Nitride ; Skip to the end of the images gallery. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 . Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 . Aero Precision EPC-9 9mm Direct Blowback Bolt Carrier Group - Nitride - APRH200060C. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. Bolt Features: Machined from 8620 Steel Black Nitride Finish Bolt . Aero Precision's 9mm Bolt Carrier Group is the ideal choice. Aero Precision EPC-9 9mm Direct Blowback Bolt Carrier Group - Nitride - APRH200060C. IN STOCK FREE SHIPPING (0) Add To Cart. IN STOCK (0) Add To Cart. Add to Cart. ADD TO WAIT LIST. Yes. Categories. About this BCG: This BCG is an AR-15 compatible design, allowing use with 9mm Luger (9x19) cartridges. Reviews (0) 9mm Bolt Carrier Groups (2 Products) Filter By . Aero Precision EPC Bolt Carrier Group, Direct Blowback, 9mm, Nitride Finish, Black, Fits AR9 APRH101200C. Sale Price: $254.98 . $139.00. View Details. This complete Aero Precision bolt carrier group is manufactured for the AR-9 rifle/pistol platform chambered in 9mm. 9mm Bolt Carrier Group, Direct Blowback - Nitride quantity. No Related Products Found. $189.99 $175.99 Sale. Thank you for submitting your review. Buy Now; AR 15 PMAG® 30 AR/M4 GEN M2 MOE® $ 12.95 Add to cart. $ 169.99 $ 159.99. Aero Precision 9mm Direct Blowback Bolt Carrier Group, Nitride. Related Products; Customers Also Viewed; Related Products. Also, the key is machined directly into the bolt carrier. Q & A. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. 3 in stock. AERO PRECISION 9mm Direct Blowback Nitride Bolt Carrier Group (APRH101200C) (No reviews yet) Write a Review . The energy of the 9mm bolt needs to be dampened to reduce wear, reduce . $174.99. Buy Now; AR 10/M5 CTR® Carbine Stock - Mil-Spec, FDE $ 64.95 Add to cart. Out of stock. For something that won't jam even after 1000 shots, that's quite a bright sign. Subscribe to back in stock notification. Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride - $169.99 The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. Product DescriptionThis 9mm bolt carrier group is compatible with both GLOCK and Colt style 9mm AR-15 magazines without any further modifications. AERO - AR15 ATLAS S-ONE M-LOK Handguard 10.3″ FDE Cerakote $ 165.74. ADD TO WAIT LIST. Faxon Firearms 9mm AR-15 Bolt Carrier Group for GLOCK or Colt Magazines - Nitride. AERO PRECISION EPC-9 9MM LUGER BOLT CARRIER GROUP The Aero Precision EPC/AR9 Bolt is the core of your EPC build. The 9mm AR-15 bolt carrier is also machined from 8620 Alloy Steel and is completed with a Nitride finish. It is a pretty soft shooter. Compliance. AR-15 Bolt Carrier Groups; Aero 9mm Bolt Carrier Group - Direct Blowback, Nitride ; Skip to the end of the images gallery. Leave a review over at r/GunDealsFU to let others know how it went! Savings: $20.01. Made in the U.S.A. LIMIT 1. Join Waitlist . IN STOCK (0) Add To Cart. Manufacturer: Aero Precision: Model: EPC BCG: UPC: 815421029437: SKU: APRH101200C: No reviews have been written for this product. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. FEDERAL American Eagle 5.56 . Aero Precision EPC Bolt Carrier Group, Direct Blowback, 9mm, Nitride Finish, Black, Fits AR9 APRH101200C View All Close. 5 in stock! SKU. IN STOCK FREE SHIPPING (0) Add To Cart. Delta Deals BCG & Charging Handle Combos Rise Armament AR-15 Charging Handle - Extended Latch + Recoil Technologies AR-15 7.62x39 Bolt Carrier Group. Ships from Distribution Facility. 9mm Bolt Carrier Group, Direct Blowback - Nitride $ 169.99 Add to cart. Available at selected store for pickup or delivery. $144.49. SKU APRH101200C UPC 815421029437 Units Out Of Stock. $15.99. Barrels. OUT OF STOCK FREE SHIPPING (0) Add To Cart. Out of stock. 9mm Bolt Carrier Group, Direct Blowback - Nitride. Made a gun related purchase recently? Bolt Carrier Group. The EPC bolt carrier group was cleanly designed to fire pistol-caliber cartridges as a blowback-operated assembly. 9mm Bolt Carrier Group, Direct Blowback - Nitride quantity. $6.00: details: Out Of Stock. Reviews . More. Skip to the beginning of the images gallery. SKU: 4486 Categories: AR-15 BCGs, Bolts, Carriers & BCGs (Bolt Carrier Groups) Price Range. Make Offer. Magpul PMAG . This Complete AR-9 9mm Bolt Carrier Group is ready to be put in your 9mm AR-15 Rifle or Pistol upper. Description; Product . Glock Oem Trigger Housing Pin G36. In-Store Only Add to Wishlist Edit. Rainier Arms 9MM Glock /Colt Compatible Precision Match Grade Bolt Carrier Group (BCG) - Nickel Boron. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms. Grunnet sommer turnes vil våre åpningstider være redusert i juni og feriestengt i juli. Out of stock. Quick View . Description; Features: 9310 Steel Material . MSRP: $169.99 | Your Price: $144.49. Barrels. Are you a dealer? CMMG's MkGs Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using their Patent Pending Radial Delayed Blowback System. Description. The EPC is initially available in 9mm, but "10mm models aren't far behind," Aero told G&A. Aero Precision. 6566297543197968408. CMMG's MkGs Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using their Patent Pending Radial Delayed Blowback System. 2 in stock! The Aero Precision design allows full auto when using binary style trigger systems. Description Reviews (0) DESCRIPTION. $169.99. Most Firearms ship for FREE: details: Classic Firearms . Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. SKU. Delta Deals BCG & Charging Handle Combos Rise Armament AR-15 Charging Handle - Extended Latch + Mercury Precision AR 9mm Bolt Carrier Group. [PARTS] 9mm Bolt Carrier Group, Direct Blowback - Nitride $169. Brands. Part Number: bc11. View Details. Special Price. The EPC-9 lineup is perfect for your next 9mm or 40S&W AR build. APRH200060C. Close. $108.77 $127.96 . Your rating: * 5 4 3 2 1. Parts. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands. SKU. Product no. SKU. $ 174.99 $ 157.49 Add to cart Secure Online Ordering. These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by . Aero 9mm Bolt Carrier Group - Direct Blowback, Nitride. Includes Firing Pin. This 9mm bolt carrier group features cuts to ensure both Glock and Colt style lower receiver compatibility. Be the first to review this product. The Battle Arms 9MM Blowback AR-15 Bolt Carrier Group is compatible with most AR-style 9mm PCC lowers since it is designed to work with both Glock and Colt style magazines. 9mm Bolt Carrier Group, Direct Blowback - Nitride. no info: details: KyGunCo. Dismiss notification . Aero . Where the Aero EPC-9 really shines is practical shooting drills. The Aero Precision 9mm BCG is the core of your EPC build. Quick view. It features removable weight for use with the Law. SKU: APRH101200C Category: Uncategorized. Wish list. Bolt Features: Machined from 8620 Steel Aero 9mm Bolt Carrier Group - Direct Blowback, Nitride. Availability: In stock. per page . 2 in stock. Purpose-built for 9mm AR-15 pistol caliber carbines, our Generation 2 PCC blow-back carriers keep the features of our well-loved first BCG with modern improvements. The firing pin is machined from 17-4 stainless steel and the extractor is forged from S7 . 9mm Bolt Carrier Group, Direct Blowback - Parkerized. The Aero Precision EPC/AR9 Bolt is the core of your EPC build. AERO PRECISION 9mm Direct Blowback Nitride Bolt Carrier Group (APRH101200C) Aero Precision (No reviews yet) Write a Review Write a Review ×. SKU. When planning your pistol caliber carbine, the Aero Precision 9mm BCG should be one of your parts of choice to ensure that your weapon fires well for years to come. 169.99. placeholder. Angstadt Arms 9mm AR-15 Bolt Carrier Group. It is compatible with most AR-15 triggers and can be used for Full Auto fire as well, with the right paperwork of course. The R1 Tactical AR 9mm Complete Bolt Carrier Group for blowback AR-15 pistol-caliber 9mm carbines that utilize Colt and Glock style magazines to include the Endomag 9mm magazine. $182.99. Availability: In stock. Buy Now . Out of stock . Add To Compare . Add to cart Buy Now. Subscribe . In Stock . Aero Precision. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme . You might also like. Description. Add to Wish List Add to Compare. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is . Click here for price! Skip to the beginning of the images gallery. ADD TO WAIT LIST. Grunnet sommer turnes vil våre åpningstider være redusert i juni og feriestengt i juli. Product no. Be the first to review this product. Compatible with both 9mm Colt and Glock Magazines. 9mm Bolt Carrier Group, Direct Blowback - Nitride $ 169.99. Be the first to review this product Product Description The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Built from the ground up to meet the extreme demands of pistol caliber blowback ARs, the EPC-9 is precision machined to the same high standards you have come to expect from Aero Precision. Comes complete with integrated ramped bolt and will accept both 9mm colt and Glock Magazines. It feels like this rifle wants to go fast, and it proved that running a series of drills known as the Gabe White Standards. $185.99 $105.99. 9mm Bolt Carrier Group, Direct Blowback - Parkerized. CMMG AR-15 BARREL & BOLT CARRIER GROUP SETS 9MM CMMG AR-15 5 BARREL & BCG SET 9MM . EPC-9 9MM LUGER BOLT CARRIER GROUP DIRECT BLOWBACK BLACK. Be the first to review this product . QTY. Primary Arms. Quick View . Alpha Shooting Sports PCC 9mm Bolt Carrier Group - V2 - Nitride. Machined from 8620 steel and heat-treated for improved strength a performance. Glock Oem Mag Flwr 9mm 4/5/6 & Gen 4. Strike Mag Release For Glock G3 Blk. This drills test a pistol shooter's skills at 7 yards with four tests. The first is a failure to stop . 9mm Bolt Carrier Group, Direct Blowback - Parkerized. $165.00. Join the waitlist to be emailed when this product becomes available. All NFA Rules Apply. Aero 9mm Bolt Carrier Group. First, the BCG is only two main parts . Availability: IN STOCK FREE SHIPPING * * * Quantity +-Add to Cart. : 100044581 815835019796 100044581 . Add to cart Buy Now. ago. 0 Review(s) 0 0 5 Write a Review. The 9mm AR-15 bolt carrier is also machined from 8620 Alloy Steel and is completed with a Nitride finish. Please add to cart for sale price $133.24 $156.75 . Calculated in Cart: details . Mfr Part: APRH200060C. 9mm Bolt Carrier Group, Direct Blowback - Nitride quantity. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. APRH200060C. DESCRIPTION The Aero Precision EPC/AR9 Bolt is the core of your EPC build. Aero Precision 9mm Bolt Carrier Group, Direct Blowback - Nitride. Machined from 8620 steel and featuring a nitride finish, fracture resistant grade 23 titanium pin, and 4140 steel extractor, the EPC bolt assembly is precision machined from the ground up to meet the extreme demands of blowback AR platform firearms.