.450 Bushmaster Complete Assembled Upper – Right Handed



Ejection Port Cover

Upgrade Handguard (Optional)

Upgrade Muzzle Devise (Optional)


SKU: 450-CAU-RH Category:


As of April of 2021, allow 5-10 days for this item to be built and shipped.

Complete ready to fire upper, with your choice of a 16″ light weight barrel, 16″ mid-weight barrel, or 18″ light weight barrel.  Includes complete bolt carrier group, charging handle, mid-length GI plastic hand guards, and A1 style flash hider. Barrel muzzle is threaded 11/16-24, barrel twist is 1:24, chromoly steel. This upper on a standard M4 style lower will result in a complete rifle weight of 6.1 pounds with the 18″ light weight barrel installed.

Note: With a Tromix 16″ light weight barrel, optional Midwest-Industries 9.25″ CRM M-Lok hand guard, and optional thread protector, the complete rifle weight on a standard M4 style lower is 5.49 pounds.

Uppers usually ship 5-10 days after the order is received.

********** All complete Tromix .450 Bushmaster uppers are test fired with Steinel Ammunition (www.Steinelammo.com) prior to shipping. **********