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  4. Gorilla MFG AR-15 .223/5.56/300blkout/350 legend USGI Mag Phos Replacement Bolt

Gorilla MFG AR-15 .223/5.56/300blkout/350 legend USGI Mag Phos Replacement Bolt

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On sale $39.99 $29.99
Retail Price:$69.99
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AR-15 .223/5.56/300blkout/350 legend USGI Mag Phos Replacement Bolt
Part Number: GM-B-P-1
Availability: In Stock

Genunine USGI Production, NOT inferior commerical grade. We've seen just a out everything out there & this is the finest Bolt made. 

SPECS


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
  • 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
  • Manganese Phosphate 
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.


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

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