91702 : AR-15 A3 Upper Receiver Assembly 450 Bushmaster® 20" BBL


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. Aluminum forearm free-foats the barrel for optimum accuracy. Heavy barrel is hard chrome-lined in bore and chamber for exceptional durability and enhanced features. 1 in 24” twist rifing, optimized for the .450 bullet. Includes 5-round .450 specifc magazine.

  • Built on the versatile Bushmaster modular AR upper platform
  • Barreled upper receivers can be used on existing AR15-type lower receivers
  • Bushmaster 4150 chrome-moly-vanadium steel barrels feature hard-chrome lining in
  • both bore and chamber for extended barrel life
  • All receivers feature integral brass defectors and hard anodized fnish
  • Each assembly is factory headspaced, proofed, test-fred and ready to use
  • Forged, lightweight 7075T6 aircraft-quality aluminum receivers incorporate all M16A2 design improvements including cartridge case defector, bolt catch assembly and raised ribs for protection against accidental magazine release
More Information
Compatibility AR15 / M4 / M16
Actions & Receivers Upper Receiver Assembly/Complete
Note 11/16"-24 Muzzle thread
Manufacturer Number 91702
UPC 604206917027
SKU 113763
Brand Bushmaster®
Color Black
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