Bolt Carrier Groups

The Aero Precision PRO 5.56 Bolt Carrier Group is built from the ground up to meet the demands of the most extreme conditions. Each component and manufacturing process of the PRO 5.56 Bolt Carrier Group was deliberately chosen to increase the reliable...

The Enhanced Bolt Carrier Group for AR15/M16 platform weapons was designed to minimize carrier tilt and reduce friction inside the upper receiver by relocating key bearing surfaces. All materials, tolerances, and coatings meet or exceed milspec...

***In Stock***   The Ultimate Hard-Use 5.56 Bolt Carrier Group: These aren't designed to be pretty. They're not meant to compete with the gorgeous museum-quality $200+ units that other well-respected manufacturers are putting out. But this is not...

DLC Finish on Outer Wear Surfaces, Phosphate Extractor and Phosphate/CL Gas Key with OCKS Carrier Key Screws.  Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are...

Now w/ OCKS Carrier Key Screws Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are individually High Pressure Tested and then undergo a Magnetic Particle Inspection. We...

***Does Not Include Carrier*** Mil-Spec Bolt - CHROME C158 Steel Shot Peened High Pressure Tested (HPT)  Magnetic Particle Inspected (MPI) *Ejector is either Chrome or Phosphate Chrome Silicon Ejector Spring by Sprinco Mil Spec Extractor -...

***Cosmetic Blemish*** These are the same spec as our ALL-CHROME w/ PHOSPHATE EXTRACTOR BCGS. They will function properly 100% of the time but may exhibit cosmetic irregularities.    These have Mil-Spec Carrier Key Screws. If you prefer the...

Please Read: This is for either the M-16 spec BOLT KIT alone, or the M-16 spec CARRIER alone, each in DLC finish. DLC Finish on Outer Wear Surfaces, Phosphate Extractor and Phosphate/CL Gas Key with OCKS Carrier Key Screws.  Microbest is one of the...

***Cosmetic Blemish*** These are the same spec as our PREMIUM BCGS. They will function properly 100% of the time but may exhibit cosmetic irregularities.    The Ultimate Hard-Use 5.56 Bolt Carrier Group: These aren't designed to be pretty...

Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. We recommend degreasing and lubricating before installation. Ships in OEM packaging. Features: All-Chrome M-16 BCG Cam Pin 4340...

Limited Edition You may already be familiar with our original Super-Stakes in Chrome. These are based on our Phosphate+ except instead of the factory staking that most of our BCGs receive, we asked our fellow San Antonio Man-at-ARms (see what we did...

Introducing the 1K3 Bolt Carrier Group. Guaranteed for Life. M16 profile Bolt Carrier Groups, these are hand inspected and given a heavy duty custom stake before being laser branded with the 1K3 designation. Includes a sleek case for transport and...

DETAILS SCP is incompatible with KAC SR15 BCG.   SCP (SOTAR Cam Pin) is a collaboration between Chad Albrecht of School of the American Rifle and Forward Controls Design.   The cam pin is a part of your rifle that pretty much no...

Limited Edition These are the same BCGs as our Premium Chrome, but we went one step farther. Instead of the factory staking that most of our BCGs receive, we asked our fellow San Antonio AR-tist (did we just coin that term?) Phillip Kimm of Bexar Arms to...

Limited Run w/ OCKS Carrier Key Screws Nitride BCGs without OCKS can be found here Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are individually High Pressure Tested and...

*Back in Stock Soon*   These have Mil-Spec Carrier Key Screws. If you prefer the Premium Variant (upgraded w/ OCKS Carrier Key Screws), Click Here. Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and...

Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are individually High Pressure Tested and then undergo a Magnetic Particle Inspection. We recommend degreasing and...

NOTE: All BCM bolt carrier groups are factory test fired. The BCG may show handling marks consistent with these quality control procedures.The Bravo Company Manufacturing Bolt Carrier Group, with a parkerized exterior and chrome lined carrier interior,...

The Daniel Defense M16 Cut Complete Bolt Carrier Group is a MIL-SPEC, full auto compatible, M16 profile bolt carrier group assembly. The 8620 steel carrier and Carpenter 158 steel bolt assembly have been heavy phosphate coated for excellent durability...