SLR Rifleworks Premium Bolt Carrier Group Black Nitride - 556 - BCG-SLR-P-556

SLR Rifleworks Premium Bolt Carrier Group Black Nitride – 556

Features

• Lugs are machined with the proper radius as per true mil-spec tolerances. Independent HP white proof testing exceeded 90,000 PSI without failure.
• Outer diameter machined to all critical surfaces within +/.0005 inches.
• Rounded cam pin rides in a fully chamfered cam path.
• Gas key with rounded leading edges ensures positive functioning in all makes and grades of uppers and buffer tube combinations.
• Properly staked and torqued grade 8 hex screws as per the true mil-spec.
• Carrier body OD and ID are hard turned after heat treatment to +/.0005 inches

Specifications

• Carrier Assembly: The enhanced bolt carrier is designed to reduce carrier tilt/cant during recoil and increase reliability by strategically relocating key bearing surfaces.
• Material: Case-hardened 8620 steel (complete care is taken during the heat treat process, so as not to harm the metal)
• Finish: Black Nitride
• Gas Key: 4130 Steel, attached with Grade 8 hardware, torqued and properly staked into a milled “valley” around a fully encased ejection port area, for added strength and rigidity.
• Cam Pin: Hardened 4340 cam pin.
• Firing Pin: Mil Spec firing pin made of 8740 steel, center-less ground, and Hard Chrome coated.
• Bolt Assembly: The Bolt is a “true” Mil Spec dimension, and external surfaces are CNC ground after heat treat for a precision fit. These bolts are held to the highest possible tolerance. The “trumpet” area behind the gas rings, where carbon normally collects, is precision CNC-ground after heat treatment to ensure as smooth an area as possible, easing cleanup and improving longevity.
• Material: 9310 Case Hardened Steel
• Finish: All Bolt components Shot Peened & Nitride Finish
• Extractor: 4340 Steel, Nitride Finish
• Magnetic Particle Inspected (MPI) and High Pressure Tested (HPT)
• Mil Spec Extractor Spring & O-Ring