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BCM Barrels

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  • 43900


In developing the USGI M4 carbine as one of the primary weapons for today’s infantry, some modifications were performed to the original M16 platform to enhance the reliability of the shorter barreled carbines. With the shorter carbine gas system and the increased gas port pressure, the carbine cycled faster, and at times the cycle rate could be faster than the magazine would feed ammunition. One of the modifications done to increase reliable feeding included enhancing the angle and the length of the feed ramps. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. This feature is offered on all BCM barrels.

  • M4 Feed Ramp Barrel Extension (USGI)
  • USGI 1/7 Twist Rates
  • USGI 5.56 NATO Chambers
  • Mil-Spec 11595E - Barrel Steel (CMV)
  • Chrome Lined Bore and Chamber
  • Manganese Phosphate Barrel Finish
  • USGI Government Profile Barrels
  • HPT (High Pressure Test) Barrels
  • MPI (Magnetic Particle Inspected) Barrels

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