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SOLGW 5.56 Bolt Carrier Group 158 Carpenter SP/HPT/MPI

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Description

  Sons of Liberty Gun Works Bolt Carrier Group HPT/MPI
Bolt:

  • Precision machined from Carpenter Technology No. 158 alloy,
  • Heat treated per mil-spec,
  • Shot peened per ASTM B851/SAE AMS2430S,
  • Vibratory tumbled
  • Individual high pressure/proof (HP)
  • Full Auto test fired as an assembly
  • Individual magnetic particle inspection ASTM E1444/E1444M (MP)
  • Markings deep laser engraved (SP=Shot Peened, HP=High Pressure Tested, MP=Magnetic Particle Inspection.)

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

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
  • Sons of Liberty Battle Flag logo deep laser engraved
  • Manganese phosphate

Gas Key:

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

Cam Pin: 

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

Firing Pin:

  •  Precision machined 8640 steel alloy
  • Heat treated/processed per mil-spec
  • Hard chrome plate

Firing Pin Retaining Pin: 

  • Precision machined from 1038 carbon steel
  • Heat treated/processed per mil-spec
  • Manganese phosphate

Additional Details

SKU:
SOLGWBoltCarrierGroup158CarpenterSPHPTMPI

Videos

27 Reviews

  • 5
    High Quality

    Published by Aaron G. on Jun 14th 2019

    This is probably one of the best bcgs in the market.

  • 5
    Outstanding!

    Published by Bob Smith on May 28th 2019

    Just today I received this BCG for my fresh assembled AR pistol. Went to the range, 210 rounds of smooth like buttah results. Thank you for the attention to detail and materials.

    THE CHAIR IS AGAINST THE WALL

  • 5
    Top Notch

    Published by Seth Parker on May 24th 2019

    As always, SOLGW goes above and beyond in providing the best quality. I bought 3 of these BCG's a year or so ago for 3 builds and I couldn't be more impressed.

  • 5
    5.55 BCG

    Published by chris on May 9th 2019

    outstanding product. function is perfect. no gimmicks, nothing over the top just a standard BCG with all the right attention on the important things such as hardware, staking, etc.. highly recommended

  • 5
    True Mil-spec

    Published by Tanner Mullen on Apr 29th 2019

    So many places claim to sell a mil-spec BCG, but very few do. SOLGW has a true mil-spec BCG that is meticulously tested before shipping out. They even upgrade it with Sprinco parts (best springs ever). You don't need fancy shit, you need shit that you know will work every time. This is it.

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