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Lightweight Bolt Carrier Group

Bolt carrier group for AR15, M16, or M4 compatible with semi and full auto versions. Carrier is machined from Mil-Spec 8620 tool steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the Mil-Spec chrome lined and heat treated gas key. Gas key is sealed then secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel then shot peened for increased strength per Mil-Spec; includes tool steel extractor with Wolff spring, viton O-ring , black insert; tool steel ejector pin spring; firing pin chromed finished with firing pin retaining pin and cam pin. Total weight completely assembled 8.2oz. HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

Complete Mil-Spec Bolt Carrier with Bolt Assembly HPT/MPI Tested:

  • Mil-Spec CNC Machined from 8620 Tool Steel case hardened to 58 - 60 rockwell with chrome lined interior
  • Mil- Spec Chrome Lined Gas Key
  • Key Staked with Grade 8 Screws, per Mil-Spec
  • Mil-Spec Carpenter 158® Bolt
  • Mil-Spec Ejector w/ Spring
  • Mil-Spec Extractor w/ Wolff Spring, viton O-ring and insert
  • Mil-Spec Firing Pin w/ Chrome Finish
  • Mil-Spec Cam Pin
  • 5.56 BCG Weight - 8.2oz.
Calculated at checkout
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  • Product Reviews


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    1. Mystic black is amazing

      I ordered the lightweight in MB and it’s amazing. Super slick. I haven’t fired it yet but broke down the bolt and every piece came coated and oiled and ready to go. Very impressed. Wish I could get an XPB with this coating, much nicer than the DLC which is already a very nice finish. This is the best finish on the market for your BCG you will not be disappointed. I love it. on 12th Jul 2019

    2. If you want the best for your build then buy this!!!

      I now own two of these lightweight bcg. One in bronze and this latest one is Mystic Black. It definitely lives up to the highest standards for an OCD gun enthusiast like myself. The finish is remarkable. The attention to detail on the small things shows up as a BCG that you know is worth every penny of its cost. I’ve only ran about 400rds through it so far with zero issues. You won’t be disappointed. BUY one!!!! on 23rd Apr 2019

    3. Lightweight BCG and Awesome Customer Service

      Purchased three of these BCG's and they are VERY high quality. Very smooth and easy to clean. I had an issue with my barrel and the team over at Cryptic helped me get everything taken care of. Great company and great products. on 10th Oct 2018


      I am now a big fan of Cryptic's. The quality of the BCG and finish is way above the competition, and it is unbelievably and unrealistically smooth and easy to clean. Forget nickel boron and everything else, this is the way to go. The price you pay is very reasonable for what you get, and shipping with Cryptic is lightning fast! 11/10 would be buying again. on 3rd Oct 2018

    5. Coated Light weight BCG

      Had a great experience with cryptic coating.
      Great service and great product!
      on 1st Sep 2018

    6. Lightweight BCG Black

      Very high quality from fit to finish. Perfect piece for a high end build. on 10th Aug 2018

    7. A Work of Art...

      Great group of people to work with. Ordered a Lightweight Mystic Silver with serrations (6.8 SPC/224 Valkyrie) and had it in my hands three days later. Unbelievable smooth performance and super easy to clean...nothing sticks to it. Will buy another BCG in the future for my next build. This bolt is truly a Work of Art! on 20th Jul 2018

    8. Raising The Bar

      This is hands down the nicest BCG I have in any of my guns. The finish is amazing. It’s almost magical how slick the surfaces are. I will update review once I put it the my test which will be soon. I can only say that I’m happy with it and if it’s as easy to clean as it is slick then it’s well worth the cost!!! on 23rd Jun 2018

    9. Work of art

      love this bcg. Looks good but most importantly works properly. I'll be buying more of these for future builds. on 21st May 2018

    10. Lightweight BCG in Mystic Black

      Haven't fired my gun with this BCG yet, but fit and finish and packaging are all BEAUTIFUL and this thing installs just as slick as can be. Absolutely beautiful BCG. on 14th May 2018