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Customer Reviews
Helpful Positive Review
The Mystic Bronze an awesome color and looks great on my AR 15 build. Due the low weight of this BCG the weight of my build came under 5.20 lbs complete. I am impressed with the quality of this BCG! The BCG cycled perfectly with carbine length gas bl...
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5/6 found this helpful
Helpful Positive Review
Low weight less recoil by Shaun, Verified Owner, January 17, 2025
I paired this with a silent capture spring on a 300 blackout. Also with a very nice trigger. It was amazing. Like playing a video game with bullets at the range. Zero recoil
3/3 found this helpful
Most Recent Reviews
smooth low mass bcg by Kp, Verified Owner, May 31, 2026
I love it in my 300 blackout. Very smooth low mass bcg
Most Recent Reviews
Cryptic coatings lowmaa BCG by tone, Verified Owner, April 7, 2026
This thing is awesome, Ib used it in 4 of my ARs, one 10.5" 300BLACKOUT, one 16" 300BLACKOUT, one 12" 5.55 and one 14.5 BCM 5.56. it worked flawlessly I n all with no changes to the buffer or buffer springs... It was noticeably lighter recoil impu...
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Most Recent Reviews
Great purchase by Annoyed, Verified Owner, March 19, 2025
Runs great, no issues installing. This is a great option for custom light weight builds.
Most Recent Reviews
beautiful LMBCG by Mark Kuehn, March 11, 2025
This is my second cryptic low mass bolt carrier group. It is made very well, and is buttery snooth when charging your rifle. Its super easy ro clean, and to maintain all around. A dmall amount of pil is needed as this polished bilt carrier group alre...
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  • Walker Defense Research Research Steel Bolt Carrier Group BCG, 5.56mm / .300 BLK, DLC, Flat Dark Earth, FDE-DLC-BCG-556
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Product Info for Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group (BCG) - Complete

Bolt Carrier Group BCG 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. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected).image

Specifications for Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group (BCG) - Complete:

Manufacturer: Cryptic
Finish: Chrome Plated
Fabric/Material: 8620 Aircraft Quality Steel, Carpenter 158 Steel
Carrier Material: 8620 Steel
Bolt Material: Steel
Caliber: 5.56x45mm NATO, .300 AAC Blackout, .223 Remington
Gun Make: AR Platform
Gun Model: M4, M16, AR-15
Hand: Ambidextrous
Weight: 8.2 oz
Condition: New
Additional Features: Thickness - 2-3 microns
Included Accessories: Standard

Features of Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group BCG - Complete

  • Reduced Carbon Fouling;
  • Easier Cleaning

Package Contents:

  • Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group - Complete
  • Gas Key
  • Key Staked with Grade 8 Screws
  • Ejector w/ Spring
  • Extractor w/ Wolff Spring viton O-ring and insert
  • Firing Pin
  • Cam Pin

Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group (BCG) - Complete Orderable Models

List of Orderable Models

  • Cryptic Low Mass Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Mystic Bronze, CC-LMS-0102 , MPN: CC-LMS-0102 , Code: 4ZT-BCG-CRYC10-CC-LMS-0102
  • Cryptic Low Mass Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Mystic Gold, CC-LMS-0101 , MPN: CC-LMS-0101 , Code: 4ZT-BCG-CRYC10-CC-LMS-0101
  • Cryptic Low Mass Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Mystic Black, CC-LMS-0100 , MPN: CC-LMS-0100 , Code: 4ZT-BCG-CRYC10-CC-LMS-0100

Cryptic .223/5.56/.300 AAC Blackout Low Mass Bolt Carrier Group (BCG) - Complete Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Cryptic Low Mass Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Mystic Bronze, CC-LMS-0102 , MPN: CC-LMS-0102-EDEMO , Code: 4ZT-BCG-CRYC10-CC-LMS-0102-EDEMO-IN-C
  • USED, Cryptic Low Mass Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Mystic Black, CC-LMS-0100 , MPN: CC-LMS-0100-EDEMO , Code: 4ZT-BCG-CRYC10-CC-LMS-0100-EDEMO-RE-B
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Last updated 2026-06-29 UTC.