MRA V1 Nitride 458 SOCOM Bolt & Barrel Kit

$599.95

8 in stock

The Maple Ridge Armoury V1 Nitride AR-15 barrel is precision CNC machined in Canada from premium, GBQ 4140 CMV steel blanks. Lapping is added quality assurance to minimize any tooling marks in the bore.

8 in stock

SKU: MRA-8301 Categories: ,

Description

MRA V1 Nitride AR-15 458 SOCOM Barrel

The Maple Ridge Armoury V1 Nitride AR-15 barrel is precision CNC machined in Canada from premium, GBQ 4140 CMV steel blanks.  These button rifled blanks are lapped and  stress relieved.  Lapping is added quality assurance to minimize any tooling marks in the bore.  The blanks are air gauge tested during final inspection to ensure the most exacting tolerances.
All V1 Nitride AR-15 barrel have precision cut chambers, gas ports, and an 11 – degree target crown.  We use an Heavy profile to achieve an optimal balance between harmonic resistance , heat resistance, and weight savings.   The 1/14” twist effectively stabilizes a wide range of common 458 SOCOM projectiles.
All Maple Ridge Armoury V1 Nitride AR-15 barrel undergo QPQ Black Nitride heat treatment. This heat treatment provides superior corrosion, wear, and abrasion resistance.  Instead of adding material to the bore (like Chrome lining), Nitride treats the existing steel by imbuing nitrogen into the surface of the steel both inside and out.  In this way, the Nitride process offers excellent accuracy potential.

We recommend the MRA 458 SOCOM Defiant Brake to pair with this barrel and bolt combination.

AR-15 Barrel Specifications

  • Material: 4140 CMV Steel
  • Treatment: QPQ Black Nitride
  • 458 SOCOM – 1/14” twist rate
  • 6 groove rifled, honed, hand lapped, and stress relieved
  • 11 degree target crown
  • 11/16-24 muzzle thread
  • Precision cut chamber and gas port
  • M4 barrel extension with enlarged, single feed ramp
  • Gas Journal: .875″
  • Gas System:
    • 18.6″ – Mid-Length
  • Weight:
    • 18.6″ HVY –
  • Lifetime Warranty
  • Made in Canada

Toolcraft Nitride AR-15 458 SOCOM Bolt and Pins

Toolcraft probably makes more BCGs than any other manufacturer in the USA, and they are excellent quality. The company’s components are so reliable that many of the big USA gun brands will not bother making their own BCG, they simply order them from Toolcraft and add their own brand name.

The bolt is made from 9310 steel, a more modern tool steel compared to the classic carpenter steel. It is a nickel-chrome-molybdenum case-hardening steel, with good strength and toughness properties. It has high hardenability, high core hardness and high fatigue strength. 9310 steel is typically used in components with large cross sections requiring high toughness and core strength such as gears, crankshafts and heavy-duty gear shafts in aircraft and truck construction.

Bolt Specifications

  • 458 SOCOM Bolt
  • 458 SOCOM firing pin
  • Ready to drop in and go
  • Mil-spec
  • Phosphate finish
  • MPI inspected (and laser marked) bolt
  • Made in USA

Additional information

Caliber

458 SOCOM

Barrel Length

Finish

Black Nitride

Profile

Medium

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