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RSR Part #: BM91702 Manufacturer Part #: 91702

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Bushmaster, Complete Upper, 450 Bushmaster, 20" Barrel, Flat Top, Black Finish, 1-5Rd Magazine


Warning: Discharging firearms in poorly ventilated areas, cleaning firearms or handling ammunition may result in exposure to lead and other substances known to the State of California to cause birth defects, reproductive harm and other serious physical injury. Have adequate ventilation at all times. Wash hands thoroughly after exposures.

  • Aluminum forearm free-floats the barrel for optimum accuracy
  • Heavy barrel is hard-chrome lined in bore and chamber for exceptional durability and has 1 in 24" twist rifling, optimized for the .450 bullet
  • Includes 5-round 450 Bushmaster magazine (1)
  • Bolt carrier assembly

Product Description

Add the hard-hitting punch of the 450 Bushmaster to your Bushmaster lower receiver instantly. AR-type gas operating system drastically reduces recoil for excellent second shot control.


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