Bolt Carrier Groups

This 9mm AR Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most 9mm AR platform rifles and pistols. The FailZero 9mm BCG is compatible with both lowers designated for Glock or Colt magazines. All critical parts are coated with EXO...

This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec AR10 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both...

Colt's Manufacturing, Mil-Spec Bolt Carrier Group, 223Rem/556NATO, Black Parkerized Finish Parkerized Mil-Spec .223/556 *These have an etched "C" on the Carrier, not the best visibilty, this how they were received from Colt.*

Roller Cam Pin with modified Gas Key for direct impingement-type rifles. Patriot Ordnance Factory, Roller Cam Pin Kit, For 223/AR15, Black Fits .223/5.56 For Direct Impingement-Type Rifles

Machined from 4140, Nitride Coating, MIL-SPEC configuration, Staked MIL-SPEC Gas Key, Full Auto Rated. Bootleg, 5.56 Lightweight Bolt Carrier Group, Machined from 4140, Nitride Coating, Mil Spec Configuration, Staked Mil Spec Gas Key Nitride...

High quality components and precise manufacturing make 2A parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on. 2A Armament, Builders...

CONSTRUCTED FROM 4340 HEAT TREATED TO 45 ROCKWELL C FOR 308 DPMS/SR25 & AR10 MELONITE COAT MADE IN THE USA LIFETIME WARRANTY WEIGHS  11.1 GRAMS IMPROVED DESIGN FOR SMOOTHER FUNCTIONING.

High quality components and precise manufacturing make Rise Armament parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on. Rise Armament,...

The LBE Nickel Boron Complete BCG includes the firing pin, retaining pin, cam pin, extractor and bolt gas rings. Made in the USA. LBE Unlimited, 556 Bolt Carrier Group, Nickel Boron Coated Fits AR-15 Complete NIB BCG Made in the USA

High quality components and precise manufacturing make Lantac parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on. LanTac USA LLC,...

The heart of a reliable AR-15 build is a quality 5.56 bolt carrier group assembly. These are the same high quality BCG's Angstadt makes for law enforcement and military groups around the world. Machined to mil-spec dimensions and finished in a beautiful...

BCG components are NiB-X coated and polished to reduce fouling adherence. Coating is guaranteed for life against chipping, spalling or flaking. Over 30K rounds in Government protocol endurance testing did not wear the coating off. Especially beneficial...