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
We have cut no corners with this BCG, we started off with a standard M16 BCG and made many improvements. Improvements like black nitride, shot peening,Carpenter 158 Steel Bolt, HPI (High Pressure Tested), MPI (Magnetic Particle Inspected); 8620 M16 carrier, Properly staked 4140 Machined Gas Key fastened with Michiguns OCKS Fasteners and Free Gas Rings for LIFE.



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

Bolt
  • 5.56/.223/.300BO
  • Machined from Carpenter 158 steel
  • Heat treated to military specifications
  • Ground to meet military required tolerances
  • SP (Shot Peened)
  • HPT (High Pressure Tested)
  • MPI (Mag Particle Inspected)

Gas Key
  • Machined from 4130
  • Heat treated to military specifications
  • Carrier keys are set with Loctite 620
  • OCKS (Optimized Carrier Key Screws) Ned Christiansen of Michiguns designed these screws. When staked properly, they offer significant improvement over conventional screws.  OCKS have deep sharp and effective knurling that extends to the top of the screw head.  These splines form pockets for carrier key metal to flow into when the key is staked, resulting in gear tooth like engagement. 
  • Torqued to spec values, and properly staked.

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

Ejector Spring
  • Sprinco Chrome Silicon Wire-stock
  • Heat Treated, Stress Relieved, and Cryogenic Processed Post Winding
  • Impregnation / Plating with Re-Micronized Molybdenum Disulfide Formulation
  • Enhanced ejector springs match the loads of a NEW Mil-Spec spring
  • Unaffected by heat up to 750ºF
  • Extreme length duty cycle while maintaining performance specifications


Firing Pin
  • Machined from 416 Stainless
  • 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

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 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.
Did you find this helpful?  2 of 2 Found Helpful
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.
Did you find this helpful?  2 of 2 Found Helpful
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.
Did you find this helpful?  2 of 2 Found Helpful
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.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Grain Valley, MO. on 7/25/2018
5

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