AR-STONER AR-15 A3 Upper Receiver Assembly 450 Bushmaster 18″ Barrel 15″ M-LOK Ultralight Handguard

Add heavy-hitting big-bore firepower to your AR-15 platform with the AR-STONER AR-15 A3 Upper Receiver Assembly in 450 Bushmaster. Featuring an 18-inch barrel engineered to handle the high energy and flat trajectory of the .450 Bushmaster cartridge, this complete A3 upper is an ideal setup for big-game hunting, feral hog management, and heavy target shooting.

Built on an A3 forged upper receiver with an enlarged ejection port specifically modified for big-bore brass clearance, this assembly comes encased in a slim 15-inch ultralight free-floating M-LOK handguard. The extended rail space provides optimal mounting options for hunting optics, tactical lights, bipods, and foregrips. Designed for direct drop-in installation, it pairs seamlessly with any standard mil-spec AR-15 lower receiver setup.

• Caliber: 450 Bushmaster

• Barrel Length: 18 Inches

• Receiver Type: Forged A3 Aluminum (Big-Bore Ejection Port)

• Handguard: 15-Inch Free-Float M-LOK Ultralight Rail

• Compatibility: Drops onto standard mil-spec AR-15 lower receivers

• Use Case: Big-game hunting (deer, elk, bear), feral hog control, and heavy-caliber range shooting

Features

450 Bushmaster Bolt Carrier Group
15″ M-LOK Handguard
18″ 1:24″ Twist Barrel
AR-STONER logo
Made In United States of America
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