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  4. Gorilla Machining AR-15 - .223/5.56 USGI NIB Replacement Bolt

Gorilla Machining AR-15 - .223/5.56 USGI NIB Replacement Bolt

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AR-15 - .223/5.56 USGI NIB Replacement Bolt
Part Number: GM-BHPTMPI-1
Availability: Out of Stock

Genuine USGI Production, NOT inferior commerical grade. We've seen just about everything out there and this is the finest Bolt made. 

SPECS

Bolt:

  • Precision machined from Carpenter Technology No. 158 alloy,
  • Heat treated per mil-spec,
  • NIB COATING
  • Shot peened per ASTM B851/SAE AMS2430S,
  • Vibratory tumbled
  • Full Auto test fired as an assembly
  • Individual magnetic particle inspection ASTM E1444/E1444M (MP)

 

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
  • NIB FAIL ZERO COTING

 

Ejector Spring: 

  • Heat treated
  • Mil Spec

 

Gas Rings: 

  • Standard stainless steel per Mil-Spec X3


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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