MA Carpenter 158 Bolt Carrier Group

MA Carpenter 158 Bolt Carrier Group

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5
Your Price: $149.95
Retail Price:$159.95
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Part Number:MA-C158-BCG
Modern Armory M16 5.56/.223/.300 BLACKOUT caliber complete Black Nitride Bolt Carrier Groups. 
Features; Shot peened, MPI (Magnetic Particle Inspected) HP (High Pressure Tested), Carpenter 158 Steel Bolt; 8620 M16 carrier, Properly staked 4140 Machined Gas Key fastened with Hardened Grade 8 Fasteners.


Free Gas Rings for LIFE.



Carrier
  • M16 style (Auto)
  • Machined from 8620 tool steel
  • Heat treated to military specifications
  • Modern Armory "MA Shield" logo deep laser engraved

Bolt
  • Machined from Carpenter 158 steel
  • Heat treated to military specifications
  • Ground to meet military required tolerances
  • SP (Shot Peened)
  • MPI (Mag Particle Inspected)
  • HPT (High Pressure Tested)

Gas Key
  • Machined from 4130
  • Heat treated to military specifications
  • Carrier keys are set with Permatex 80017 Gasket Sealer
  • Grade 8 hex screws are set with Loctite 271 Red then torqued and staked all per mil-spec

Gas Rings
  • Standard stainless steel

Extractor
  • Machined from 4140
  • Heat treated to military specifications
  • Shot peened

Extractor Spring
  • Sprinco 5 coil XP Spring
  • Chrome Silicon Wirestock
  • Heat Treated, Stress Relieved, and Cryogenic Processed Post Winding
  • Impregnation / Plating with Re-Micronized Molybdenum Disulfide Formulation
  • Mil-Spec Black Extractor Inserts
  • Mil-Spec Viton O-Rings

Ejector

  • S7 Tool Steel
  • Heat treated per ASTM A681-08
  • Shot peened per Mil-Spec

Firing Pin
  • Machined from 416 Satinless
  • Heat treated to military specifications
  • Ground to meet military required tolerances

Cam Pin
  • Machined from 8620
  • Quench and temper heat treat
  • Ground to meet military required tolerances

Firing Pin Retaining Pin
  • Precision machined from 1038 carbon steel
  • Heat treated/processed per mil-spec
  • Nitride finish


The Modern Armory 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
Badass BCG
I've purchased a few of these Bolt Carrier Group from Modern Armory. I shot the shit out of them unsuppressed and suppressed, still holding strong . One of the BCG's has over 5,000 rds and still going strong.
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Reviewed by: (Verified Buyer)  from Johnstown, Colorado. on 7/19/2018
5
5 Stars
Worth Every Penny
This bcg is worth every penny and many more, I love the C158 bolt and Sprinco springs. So far only 1k rounds on it but this thing is a beast. Thanks again Modern Armory for the great CS.
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Reviewed by: (Verified Buyer)  from Houston. on 7/15/2018
5
5 Stars
Great Bolt Carrier Group
I purchased this a few months back and haven't had a single problem, shot about 500 rds and slight finish wear but that could be lack of lube. Love the products on here and it is always great to talk with Don.
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Reviewed by:  from Alabama. on 6/20/2018
5
5 Stars
Great BCG!
We run Modern Armory BCG’s in one of our 10.5” Post sample, suppressed, machine guns. This BCG gets ran hard & cycles like a dream. Great staking, great components & no questioning it’s quality. Will definitely be adding more to our collection.
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Reviewed by:  from Grain Valley, MO. on 7/25/2018
5

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