Enhanced Mil Spec BCG

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(9 reviews) Write a Review


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, C-158 (Carpenter) 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.


  • C-158 Bolt MP inspected, High Pressure Tested
  • 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.

Additional Details

Type Of Part:
5.56mm (.223)
300 Blackout

9 Reviews

  • 5
    Use for new build

    Published by Raymond M Basurto on 5th Dec 2023

    Have used your products in a past build and was very happy with the results. If it's not broke don't mess with a great product!

  • 5
    After 2,000 Rounds

    Published by Kevin M on 1st Jun 2023

    Excellent BCG both suppressed and unsuppressed. Cycles very well with zero issues even when caked in carbon build up. Full confidence in this BCG.

  • 5
    After 500 Rounds

    Published by Kevin M on 1st Mar 2023

    Own a Nickel Toolcraft. Griffin’s BCG is premium to that. Such a flawless output with a suppressed 300 blackout build. Cleans easily.

  • 5

    Published by Gary on 20th Jan 2023

    Top quality, American made, fast shipping, efficient, furthermore, this is the kind of small businesses we need.

  • 5
    Incredible craftsmanship

    Published by Christopher Holland on 17th Nov 2022

    Beautiful product, great price, made with pride. This Is the only BCG you should be running!

  • 5
    Enhanced BCG

    Published by Adam on 13th Apr 2020

    Oustanding product. I bought this BCG for my 300 blackout build and it has performed as expected, flawlessly. The mass is perfect, not too heavy, not to light for suppressed applications. Easy to clean.

  • 5
    Enhanced Mil Spec BCG

    Published by Ed Perrott on 6th May 2019

    Everything I buy from Griffin Armament exceeds my expectations. This BCG is no exception. Flawless workmanship. Beautiful detail and finishing. Most smooth operation! Thanks

  • 5
    Title of review 226

    Published by Susquehanna Valley Firearms LLC on 6th Oct 2018

    These are excellent quality. We started selling these in our shop and they are easy to maintain and have performed flawlessly.

  • 5
    Best BCG out there

    Published by Jeremy Fitzgerald on 7th Aug 2018

    Having had BCG's from almost every company, I originally bought this one just for the price. Boy am I glad I did. This thing has done nothing but impress me right out of the nicely packaged box. On top of all the other quality features the coating was perfect and has held up extremely well. Would highly recommend to anyone looking for a BCG.

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