18" 450 Bushmaster Upper Assembly AR 15 Extended Rifle Length Rail
*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.
*15" Extended Rifle Length Narrow Profile Free Float
Rail. Very comfortable and very light weight. Your choice of Keymod or M Lok slots. Slots run the entire length of our rail
at the 3, 6, and 9 o'clock postions. Picatiny rail sections NOT included
but are available for purchase on our website if needed. 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.
*AS OF 01-11-2019 WE HAVE A MINOR DISRUPTION IN OUR NORMAL MUZZLE
BRAKE SUPPLY FOR THIS CALIBER AND WE ARE NOW SUBSTITUTING IT FOR A NEWER STYLE AS SEEN IN THE ADDITIONAL PRODUCT PICTURES. SEE OPTIONS TAB FOR MUZZLE DEVICE TO CHOOSE A DIFFERENT STYLE IF YOU WISH.*This upper assembly will fit all standard AR 15 lower receivers