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Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group (BCG) - Complete Up to $14.50 Off, Coupon Available w/ Free Shipping — 6 models

Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
1 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
2 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
3 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
4 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
5 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH
6 of 12 images
Cryptic Bolt Carrier Group - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
7 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
8 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
9 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
10 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
11 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH
12 of 12 images
Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH

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Questions & Answers
Is this compatible with the Stags Arms LH upper Expert Answer

The Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Groups will work with a Mil-Spec dimension Stag Arms Left Handed Upper Receiver.

by Hunter, Gear Expert, December 7, 2022
Can I take the 556 bolt assembly out of this carrier group and replace it with a 7.62x39 cryptic bolt assembly? Expert Answer

You should be able to change out the bolt in the Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group - Complete.

by Hunter, Gear Expert, October 7, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Best BCGs I've ever owned hands down. If you're a lefty with left side ejection, BUY IT! by Brandon Murata, Verified Owner, June 21, 2025
You will NOT regret buying this left handed BCG. 5 years ago, I was skeptical about getting into the left side ejection AR game due to the limitations of parts availability for vital components such as the BCG and bolt. THANK GOD for Cryptic! Not onl...
Read More...
1/1 found this helpful
Helpful Positive Review
very slick surface by KW, August 17, 2024
Very slick surface. I don’t expect this to have any issues
1/1 found this helpful
Most Recent Reviews
Cery Nice BCG by Kevin, Verified Owner, May 18, 2025
This bolt carrier has a very nice smooth finish. Haven’t finished the build yet, but this is perfect and was a great deal.
Most Recent Reviews
Please with purchase by Karl, Verified Owner, April 3, 2025
I’m very pleased with this bolt I put together a left-handed upper and it was one of the very few that I could find that was decent priced it assembled well and appears to be very well-made
Read All 4 Reviews

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Product Info for Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group (BCG) - Complete

Coated Bolt Carrier Group BCG (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158 steel and shot peened for increased strength per Mil-Spec; includes tool steel extractor with spring and viton O-ring; firing pin chromed finished with firing pin retaining pin and cam pin. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected).image

Specifications for Cryptic .223/5.56/.300 AAC Blackout Left Hand 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: M16, M4, AR-15
Hand: Ambidextrous
Weight: 11.55 oz
Condition: New
Included Accessories: Standard

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

  • Reduced Carbon Fouling;
  • Easier Cleaning

Package Contents:

  • Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group - Complete
  • Chrome Lined Gas Key
  • Key Staked with Grade 8 Screws
  • Bolt w/ Spring and Ejector
  • Tool Steel Extractor w/ Spring and viton O-ring
  • Firing Pin w/ Chrome Finish
  • Cam Pin

What firearm models does the manufacturer say Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group (BCG) - Complete is compatible with?

The manufacturer says that Cryptic .223/5.56/.300 AAC Blackout Left Hand Bolt Carrier Group (BCG) - Complete is compatible with AR-15, M4, M16

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

List of Orderable Models

  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH , MPN: CC-0104-LH , Code: 4ZT-BCG-CRYC09-CC-0104-LH
  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH , MPN: CC-0103-LH , Code: 4ZT-BCG-CRYC09-CC-0103-LH
  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH , MPN: CC-0100-LH , Code: 4ZT-BCG-CRYC09-CC-0100-LH
  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH , MPN: CC-0109-LH , Code: 4ZT-BCG-CRYC09-CC-0109-LH
  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Bronze, CC-0102-LH , MPN: CC-0102-LH , Code: 4ZT-BCG-CRYC09-CC-0102-LH
  • Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH , MPN: CC-0101-LH , Code: 4ZT-BCG-CRYC09-CC-0101-LH

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

List of Unorderable Models

  • USED Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH, EDEMO1, Condition Fair, Used , MPN: CC-0104-LH-EDEMO1 , Code: 4ZT-BCG-CRYC09-CC-0104-LH-EDEMO-US-D
  • USED Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH, EDEMO2, Condition Fair, Other , MPN: CC-0104-LH-EDEMO2 , Code: 4ZT-BCG-CRYC09-CC-0104-LH-EDEMO-OT-D
  • USED, Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Magnese Phosphate, CC-0104-LH , MPN: CC-0104-LH-EDEMO , Code: 4ZT-BCG-CRYC09-CC-0104-LH-EDEMO-RE-A
  • DEMO, Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Midnight, CC-0109-LH , MPN: CC-0109-LH-DEMO , Code: 4ZT-BCG-CRYC09-CC-0109-LH-DEMO
  • DEMO, Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Gold, CC-0101-LH , MPN: CC-0101-LH-DEMO , Code: 4ZT-BCG-CRYC09-CC-0101-LH-DEMO
  • USED Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH, EDEMO2, Condition Parts Only/Salvage, Defective , MPN: CC-0100-LH-EDEMO2 , Code: 4ZT-BCG-CRYC09-CC-0100-LH-EDEMO-DF-F
  • DEMO, Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Black, CC-0100-LH , MPN: CC-0100-LH-DEMO , Code: 4ZT-BCG-CRYC09-CC-0100-LH-DEMO
  • USED, Cryptic Bolt Carrier Group BCG - Complete, .223/5.56/.300 AAC Blackout, Left Hand, Mystic Silver, CC-0103-LH , MPN: CC-0103-LH-EDEMO , Code: 4ZT-BCG-CRYC09-CC-0103-LH-EDEMO-RE-B
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