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Your build will begin within 14 days from the date your FFL copy is received (for FFL Transfers), or within 14 days from the date your order was placed (for local pickup). You will be notified via email when your order is shipped or ready for pickup.

Product Overview


Caliber: .450 Bushmaster
Action: Semi-Automatic
Barrel: 18 inch, 1:24 Twist, Mid-length Gas System, .750 Gas Block, Modified M4 Feed Ramps
Thread: 11/16 x 24
Handguard: 15" M-Lok aluminum
Overall Length: 35”
Weight: 6.2 lbs.
Magazine: 5-round magazine
Your Choice: GLFA stock cerakote color [see color squares above] and barrel finish [416R SS or 4150 CRMOV Nitride]

Due to federal regulations, complete firearms and lower receivers can only be shipped to Federal Firearms License (FFL) holders. If you purchase a firearm or lower receiver, we must receive a signed copy of an FFL before we can begin building your order. Please contact your FFL and have them email a copy of their signed license to as soon as you complete your purchase. Please make sure your name and GLFA order number are both included in the email.

***If your firearm or lower receiver is being shipped to CA, CO, CT, D.C., HI, IL, MD, MA, NJ, NY, VT, please contact us by phone or prior to making a purchase.

Warranty Information

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


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  • 4
    450 Bushmaster great quality

    Posted by Joshua Turner on Nov 29th 2021

    Light, tactical, good quality product. Kicks the same as a 30-06, good accuracy and penetration The only reason I took 1 star off, it is incredibly loud. Definitely have to wear a headset no matter the situation, makes home defense iffy.