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Gorilla Machining AR10 .308 Bolt Carrier Group Black Nitride

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On sale $139.99 $114.99
Retail Price:$159.99
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Gorilla Machining AR10 .308 Bolt Carrier Group Black Nitride
Part Number: GM-BCG-1-2-2
Availability: In Stock

GORILLA MACHINING  BCG was made for 7.62x51 / .308 Cal Platforms.   Made in the USA, this group comes fully assembled with properly torqued and staked gas key.


Bolt:

  • Precision machined from Carpenter Technology No. 158 alloy,
  • Heat treated per mil-spec,
  • Shot peened per ASTM B851/SAE AMS2430S,
  • Vibratory tumbled
  • Full Auto test fired as an assembly

 

Extractor: 

  • Precision machined from 4340 tool steel alloy per SAE AMS6415T/AMS6484D (vs 4140),
  • Heat treated
  • Shot peen per ASTM B851/SAE AMS2430S

 

Extractor Retaining Pin: 

  • Precision machined and ground S7 Tool Steel
  • Heat treated per ASTM A681-08
  • Shot peened per mil-spec print
  • Manganese phosphate

 

Extractor Spring:

  • Tactical Springs/Sprinco 5 coil, ASTM Grade A401 Chrome Silicon wire stock
  • Heat treated
  • Stress relieved, Molybdenum-Disulfide infused
  • Cryogenic processed (all post winding)
  • Mil-spec black insert/synthetic elastomer extractor buffer (nitrile-butadiene, shore hardness 80+/-5 durometer per MIL-PRF-6855)

 

Ejector:

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

 

Ejector Spring: 

  • Heat treated
  • Mil Spec

 

Gas Rings: 

  • Standard stainless steel per Mil-Spec X3

 

Carrier:

  • Machined from AISI 8620 aircraft qualty alloy per ASTM A108/A322-13
  • Full auto profile
  • Heat treated
  • Carburized/strain relieved, hard chrome bore
  • Precision ground gas key interface
  • Black Nitride

 

Gas Key:

  • Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
  • Heat treated, hard chrome internal
  • Black Nitride
  • Permatex sealed
  • Grade 8  hex screws torqued and staked 

 

Cam Pin: 

  • Precision machined 4340 chromoly steel alloy per SAE AMS6415T/AMS6484D
  • Heat treated/processed
  • Manganese phosphate
  • Solid film lubricant applied and cured 

 

Firing Pin:

  • Precision machined 8620 steel alloy
  • Heat treated/processed per mil-spec
  • Hard chrome plate

 

Firing Pin Retaining Pin: 

  • Precision machined from 1038 carbon steel
  • Heat treated/processed 
  • Manganese phosphate



Why do others substutute other inferior/untested steels? To decrease the cost of the part. Carpenter 158® is a high technology steel that is very expensive and can only be ordered in 20,000 lb mill runs. It is the only steel allowed by the US (and Foreign) Militarys for the very demanding needs of this high stress, critical part.

 

*NOTE: BARRELS & BOLTS MUST BE PROPERLY CHECKED FOR HEADSPACE PRIOR TO USE. FAILURE TO DO SO MAY RESULT IN DAMAGE, PERSONAL INJURY, OR DEATH*



LIFETIME WARRANTY:

Our products carry a lifetime, no questions asked, warranty. Simply put... Should any of our products fail, return it to us for a brand new replacement.

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