Due to increased demand, please expect delays in shipping times. Washington State Magazine Orders will be prioritized so they can be delivered before July 1, 2022. We are no longer accepting orders on magazines with 10+ capacity to the state of Washington.

Out of stock
Bushmaster .450 16" Barrel Flat-Top Complete Upper Assembly - 91700
Out of stock

Bushmaster .450 16" Barrel Flat-Top Complete Upper Assembly - 91700

SKU 792648
Brand Bushmaster
Model Number 91700
UPC 604206917003
Customers must read Compliance Information before purchasing.

Product Details


  • Type: Flat-Top
  • Handguard: Black Carbine Length
  • Caliber: 450 Bushmaster
  • Barrel Type: Heavy
  • Barrel Length: 16"
  • Barrel Material: Carbon Steel
  • Twist Rate: 1:24"
  • Receiver Material: Carbon Steel
  • Receiver Finish: Black
  • Barrel Finish: Black Parkerized


This Bushmaster upper receiver is made of carbon steel with carbine length hand guards. Its barrel is parkerized black and the receiver and hand guard are finished black teflon.

Add the hard-hitting punch of the 450 Bushmaster to your Bushmaster lower receiver instantly. AR-type gas operating system drastically reduces recoil for excellent second shot control.


  • Aluminum forearm free-floats the barrel for optimum accuracy
  • Heavy barrel is hard-chrome lined in bore and chamber for exceptional durability and has 1:24 inches twist rifling, optimized for the 450 bullet
  • (1) Includes 5 round 450 Bushmaster magazine
  • Bolt carrier assembly


Q & A


All NFA Rules Apply.
These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.