Titanium Nitride C158 BCG

On sale: $158.88
Out of Stock.
Part Number:C158-TIN-BCG
The MA Bolt Carrier Group - Auto Version - for your M4 or AR15.

  • M16 Titanium Nitride 8620 Alloy Steel Carrier
  • MA Shield Logo Laser Engraved
  • Carpenter 158 Steel Bolt
  • Heat Treated
  • Shot Peened
  • HPT Bolt - High Pressure Tested 
  • MPI Bolt - Magnetic Particle Inspected
  • 4140 Phosphate Extractor (NON MIM)
  • Sprinco 5-coil Extractor Spring
  • Sprinco Ejector Spring
  • 8620 Nitride Gas Key (Hand Lapped)
  • Gas Key Properly Installed Using Vibra-Tite 541 with OCKS Fasteners
  • 8640 Steel Chrome Plated Firing Pin 
  • 8620 Cam Pin with directional arrow lasered on
  • Bolt Comes Pre-Lubed with our house blended lube

The warranty is NOT transferrable and is only valid to the original purchaser.

Each BCG is individually test fired (3rds of ARMSCOR 223REM 55GR) BCG will ship as is, BCG was lubed and might be dirty from the test firing procedure.

The MA Defense Bolt Carrier Group is proudly MADE IN THE USA by hard working American men and women.

*Lifetime Guarantee covers manufacturing defects in materials and workmanship, regardless of the age of the product, but it does not cover normal wear and tear. Wear and tear is damage that naturally and inevitably occurs as a result of normal use.

ITAR: International Traffic in Arms Regulations Controlled

5 Stars
ProGlock member #86
Finally after waiting months Modern Armory restocked and delivered in days.
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Reviewed by:  from 19090. on 2/13/2023

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