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Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG) Up to 14% Off — Free 2 Day Shipping w/ code 2DAYAIR — 2 models

Special offer available for this product. Click here to see!
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Midnight, CC-LMS-0109
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Silver, CC-LMS-0103
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Midnight, CC-LMS-0109
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Silver, CC-LMS-0103
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Midnight, CC-LMS-0109
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Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Midnight, CC-LMS-0109
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Silver, CC-LMS-0103
2 of 4 images
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group, Mystic Silver, CC-LMS-0103
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Midnight, CC-LMS-0109
3 of 4 images
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Midnight, CC-LMS-0109
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Silver, CC-LMS-0103
4 of 4 images
Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Silver, CC-LMS-0103

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Questions & Answers
Can it run all three calibers listed? My main concern is can I run 300aac if I were to purchase this exact BCG?

Yes. The case for all 3 rounds uses the same base diameter and rim thickness. It was one of the main criteria for making 300BLK that the only change needed from a 5.56 was a new barrel. Same BCG, same mags. You’re good to go!

by chris, Verified Owner, February 13, 2026
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
cryptic low mass bcg by DIGIMAN, Verified Owner, October 22, 2025
Runs great for subsonic 300 blk. Seems to be gas efficient. Perfect for a low recoil build coupled with an adjustable gas block, reduced power spring and a 1.7 ounce buffer I had zero malfunctions. Works with an FRT but needs a h1 to reduce bolt boun...
Read More...
1/1 found this helpful
Most Recent Reviews
smooth bcg by Kp, Verified Owner, March 7, 2026
I love this bcg installed on my 300 Blackout. Great product
Most Recent Reviews
best BCGs on the Market by Jacob Burks, Verified Owner, July 13, 2025
Cryptic has the best BCGs hands down. I also have the mystic black and that thing is definitely the smoothest BCG ive ever used!!! Highly recommend
Read All 3 Reviews

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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 Steel Bolt Carrier Group (BCG)

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.image

HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected).

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

Manufacturer: Cryptic
Fabric/Material: Carpenter 158 Steel, 4140 Billet Tool Steel
Caliber: 5.56x45mm NATO, .223 Remington, .300 AAC Blackout
Gun Make: AR Platform
Gun Model: M16, M4, AR-15
Hand: Right
Weight: 8.2 oz

Features of Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG)

  • 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
  • BCG Weight 8.2oz.

Package Contents:

  • Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group

What firearm models does the manufacturer say Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG) is compatible with?

The manufacturer suggests that Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG) is compatible with AR-15, M4, M16

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

List of Orderable Models

  • Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Midnight, CC-LMS-0109 , MPN: CC-LMS-0109 , Code: 4ZT-BCG-CR21-CC-LMS-0109
  • Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group BCG, Mystic Silver, CC-LMS-0103 , MPN: CC-LMS-0103 , Code: 4ZT-BCG-CR21-CC-LMS-0103
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Last updated 2026-08-12 UTC.