GLFA .450 Bushmaster - Complete Upper (6 Colors Available)

Great Lakes Firearms and Ammunition, LLC

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Your build will begin within 10 days from the date your order was placed. You will be notified via email when your order is shipped or ready for pickup.
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Product Overview


Action: Semi-Automatic

Barrel: 18 inch, 1:24 Twist – Either 416R SS or 4150 CRMOV Nitride, 11/16 x 24 threads

Caliber: .450 Bushmaster

Feed Ramps: Modified M4

Finish: Cerakote

Gas System: 0.750 Gas Block and Mid Length Gas Tube

Handguard: 15.25" Aluminum 6061 – Full picatinny rail

Mags included: None

Muzzle Brake: Included - Designed to be 6 degrees forward, wrench tightened w/o Loctite

Sights: None

Upper Receiver: 7075 Oversized Upper

Overall Length: 27.00”

Weight: 4.2 lbs

Warranty Information

GLFA Lifetime Warranty - See "Returns & Repairs" page for more details.


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  • 5
    Great upper!

    Posted by Shane on Jun 16th 2023

    I’ve owned this GLFA upper for a year now. Fit up well to my Anderson lower. I’ve been super impressed with the quality and accuracy! I’ve taken a few deer with this rifle. I’ve had zero cycling issues with it. Very dependable product. Definitely can’t wait to build another!