ATI Mil-Sport Upper Complete 450 Bushmaster 16in 1:24 AR-15 M-LOK 15in

The ATI ATI15MS450BM Mil-Sport Upper Complete 450 Bushmaster 16" Black Nitride Barrel/7075-T6 Aluminum Black Anodized Receiver 15" M-LOK Handguard for AR-15 delivers a drop-in ready upper receiver assembly crafted from forged aluminum in the Mil-Sport lineage, featuring a 16" 1:24 twist barrel finished in black nitride and chambered for 450 Bushmaster, paired with a black nitride bolt carrier group. This complete upper sits atop a black anodized receiver and incorporates a 15" aluminum free-floating key-mod rail over a carbine-length low-profile DGIS gas system, plus an A2-style compensator for controlled recoil and reliable cycling. Built to fit any AR-15 pattern lower, this upper is 100% Made in USA and assembled in Summerville, SC, offering rugged reliability and precise chambering for big-bore performance in a streamlined, ready-to-install package. The combination of the 16" barrel, robust 450 Bushmaster chambering, and the generous 15" M-LOK handguard supports versatile configurations for hunting, target shooting, and practical field use, delivering solid accuracy and dependable function in a compact upper that seamlessly integrates with existing AR-15 platforms.