The AR-STONER AR-15 Side Charging Upper Receiver assembly chambered in 450 Bushmaster delivers precision accuracy at an affordable price. The machined billet aluminum upper receiver is combined with an extruded aluminum free float M-LOK handguard and both are Type III hard coat anodized.
This complete upper features a mid-length gas system, a mil-spec bolt carrier group, heavy-profile barrel with a parkerized finish and a lightweight 15” free float AR-Stoner M-LOK handguard and a flash hider.
Attach your favorite sling to the free float handguard with integrated QD mounts and use the precision M-LOK cutouts at the three, six, and nine o’clock positions for mounting MIL-STD 1913 Picatinny rails or other direct-attach M-LOK accessories.
Cartridge 450 Bushmaster
Weight 5.2 Pound
Barrel Length 16 Inches
Twist 1:24 Inches
Barrel Contour Heavy
Barrel Finish Matte
Chrome Lined No
Gas Block Diameter 0.875 Inches
Gas System Length Carbine
M4 Feed Ramps Yes
Upper Receiver Type Side Charging
Barrel Material Steel
Handguard 15″ M-LOK
Bolt Carrier Assembly Included Yes
Muzzle Device Muzzle Break
Mil-Spec or Commercial Mil-Spec
Country of Origin United States of America
Shipping Weight 6.060 Pounds