Description

GRIFFIN ARMAMENT ENHANCED BOLT CARRIER GROUP (5.56MM / 300 BLK)

Why a BCG from Griffin Armament? The simple answer is that these BCG’s are the best we’ve used in our ten years of military service and over a decade of industry involvement. When you look at a top shelf product you can see its quality. These are the best mil spec pattern there are.

The Griffin BCG combines an 8620 carrier, 9310 Bolt, 4340 cam pin and extractor. All the proper heat treats, the correct shot peen, and the often neglected post heat treated grind are present. In a market filled with cast component BCG’s, all components are billet machined and all surfaces receive a finish pass in machining for improved surface smoothness. There are varying degrees of quality in Melonite QPQ finishes. These BCG’s went to 4 finishing houses for selection of the finish provider, cost not being a consideration. The result is a deep black finish with remarkable lubricity. These are assembled to the current military technical data package with permatex’d and properly staked carrier keys. They also feature the current 15,000 round extractor spring design and a Crane O ring for reliable extraction in extreme conditions. We ran these thousands of rounds in multiple manufacturers rifles throughout the T&E phase without a single malfunction. From first sight through months of use to the final product launch we have remained excited to bring this BCG to market. This is the only BCG that has ever excited us and that is why we have chosen to offer it to the people we care about, our customers.

Many Metallurgists consider AISI 9310 alloy steel as an acceptable bolt material and substitute for Carpenter 158 (Carpenters brand name AISI P6 Spec mold steel). However for the M4 purists we offer our BCG with the optional Carpenter 158 bolt made to current Mil-Spec including phosphate rather than Melonite treatment which comes with the 9310 bolt.

8620 Carrier
9310 Bolt MP inspected, High Pressure Tested (Carpenter 158 available)
Bolt properly heat treated, shot peened, and post heat treat ground with headspace held to half the blueprint specification
4340 Cam Pin & Extractor
Finish Pass Machined on all surfaces
Full Billet Construction
Premium Melonite QPQ Finish
Latest 15k round Extractor Spring Design
Crane O-ring for increased extraction reliabilty in extreme conditions
Billet machined gas key, installed with permatex and staked to current TDP

Satisfaction guaranteed per our return policy.