18" 450 Bushmaster FDE Upper Assembly AR 15 Rifle Length Rail Flat Dark Earth
*Milspec forged aluminum upper receiver with forward assist and dust
assembly installed. Matte black hard coat anodized Mil 8625 Type 3 Class
2. One large single Feed Ramp for big bore cartridges. Forged from 7075 T6 aluminum. This receiver has been
correctly modified around the ejection port to allow for clearance and
proper ejection of the 450 Bushmaster cartridge.
*AR15Part.com Premium 12.5" Rifle Length Narrow Profile KEYMOD
Rail. Fit and Finish on our newest line of free float rails is outstanding. 100% US Made.
Very comfortable and very light weight. Keymod slots run the entire length of our rail
at the 3, 6, and 9 o'clock postions. Keymod rail sections NOT included
but are available for purchase on our website if needed. Keymod rail
sections easily attach to our rails for adding accessories like bipods,
flash lights, grips, lasers, etc.
*18" 450 Bushmaster 4150 Hardened Chrome Moly Steel Barrel with 1x24 twist. Heavy
Contour with 5/8x32 muzzle threads. Proper single feed ramp for 450 Bushmaster cartridge. Parkerized finish.
*.750 low profile gas block.
*Mid Length Gas Tube.
*Compact competition muzzle brake with crush washer. *This upper assembly will fit all standard AR 15 lower receivers