--- title: "CMC Triggers Enhanced AR15 BCG Black Nitride" description: "Enhanced AR15 bolt carrier group with black nitride finish, flared carrier design, and mil-spec bolt components. Compatible with .223, 5.56, and 300BLK." canonical_url: "https://www.kygunco.com/product/cmc-triggers-81631-enhanced-bcg-std-ar15-5.56-223-nitride-mil-spec" meta: author: KYGUNCO "og:description": "Enhanced AR15 bolt carrier group with black nitride finish, flared carrier design, and mil-spec bolt components. Compatible with .223, 5.56, and 300BLK." "og:image": "https://cdn.kygunco.com/assets/products/156799/thumbnail.jpg?v=1712142083" "og:image:height": "500" "og:image:width": "500" "og:title": "CMC Triggers Enhanced AR15 BCG Black Nitride" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Gun Parts](https://www.kygunco.com/category/shooting/gun-parts) / [Handgun & Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts) / [Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts) / [Upper Receiver Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/upper-receiver-parts) / CMC-81631 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/156799/main.jpg?v=1712142083) For illustration purposes only, this image may not be an exact representation of the product. # CMC TRIGGERS Enhanced BCG: Std AR15 5.56/223 Nitride Mil Spec Enhanced AR15 bolt carrier group with a black nitride finish, designed for 5.56/.223 applications. Features a flared carrier to help reduce carrier tilt, fewer contact points for less friction, and a true mil-spec bolt with CNC-ground surfaces, hardened cam pin, Mil-Spec firing pin, and tested extractor components. $179.10 ** 5 interest-free payments of **$35.82** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** Online In Store ** Flat Rate $13.94 for every 25 lbs. Shipping to HI & AK may incur additional fees. ** Ships To Your Home Fulfilled by a partner warehouse. ** Partner Fulfilled Selling fast. Limited quantities available. Item # 156799 Style CMC-81631 UPC 810943030961 Condition New Manufacturer [CMC Triggers](https://www.kygunco.com/brand/cmc-triggers) Weight 1 lb ### CMC Triggers Enhanced BCG: Std AR15 5.56/223 Nitride Mil Spec CMC Triggers Enhanced Bolt Carrier Group was designed for shooters who demand superior performance weapon components in the heart of their firearm. CMC proudly manufactures the highest quality firearms components in the industry. **Carrier Assembly:** The flared rear of the enhanced bolt carrier is designed to reduce carrier tilt/cant during recoil and increase reliability by strategically relocating key bearing surfaces. Made from Case-hardened 8620 steel. The CMC enhanced carrier has fewer points of contact, resulting in less friction area. The increase in mass ensures proper gas pressure and increases dwell time, thus improving extraction while shooting suppressed or short-barreled rifles (SBRs). Bolt Assembly: The Bolt is a "true" Mil-spec dimension. The external surfaces are CNC ground after heat treatment for a precision fit. The bolts are held to the highest possible tolerances. The "trumpet" area behind the gas rings, where carbon collects, is precision CNC Ground after heat treatment, to ensure as smooth of an area as possible, easing clean up and longevity. Made from 9310 Case Hardened Steel, bolt components are Shot Peened & Black Nitride coated. **SPECIFICATIONS** - Black Nitride finish - Enlarged forward ports - Optimized for suppressor use - Hardened 4340 cam pin - Mil-Spec 8740 steel firing pin - MPI and HPT tested - Mil-Spec Extractor Spring & O-Ring - .223/5.56/300BLK compatible ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from CMC Triggers ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/cmc-triggers-81631-enhanced-bcg-std-ar15-5.56-223-nitride-mil-spec#webpage","@type":"WebPage","description":"Enhanced AR15 bolt carrier group with black nitride finish, flared carrier design, and mil-spec bolt components. 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