Faxon Firearms 16 inch .450 Bushmaster AR 15 Barrel – Carbine Gas – 4150 QPQ

SKU: 15A45016C16NGQ

Click Here for Price
Out of Stock
Orders will Ship within 1 Business Day
AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel Gas Block - .875"


AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3 Stainless Gas Tube with Roll Pins - Carbine Length


Big Bore Barrel for your new “Thumper” AR-15

If you’re looking to sling serious lead through your AR-15, you’re probably looking at the big bore options for the caliber.  .450 Bushmaster is an excellent cartridge for big game, and Faxon Firearms has designed a barrel to give you the performance you need in the field, while retaining lighter weight for better handling.

This rugged barrel is constructed from 4150 Chrome Moly Vanadium steel, and finished with a nitride/QPQ finish for long life and resistance to the elements.

A Barrel Made for Hunters on the Move

Right away, you can tell that this Thumper barrel is different, with the “Gunner” profile barrel.  The taper towards the muzzle keeps the front end of your rifle easier to handle for snap shots, while retaining the weight behind the gas port to retain accuracy.

Since .450 Bushmaster is a straight-walled cartridge, this is a perfect part for building a semi-auto for  hunts where other cartridges may be restricted.

  • Barrel Material: 4150 CMV
  • Barrel Type: Button Rifled
  • Barrel Caliber: 450 Bushmaster
  • Barrel Twist: 1:16
  • Barrel Length: 16”
  • Barrel Profile: Gunner Big Bore
  • Barrel Gas System: Carbine
  • Inside Finish: Salt Bath Nitride
  • Outside Finish: Salt Bath Nitride
  • Muzzle Thread: 11/16×24
  • Gas Block Diameter: .875″
  • Gas Block Journal Length: 1.1″
  • Barrel Extension: Big Bore barrel extension
  • Weight:  1.72  lbs
  • Magnetic Particle Inspected
  • Polished 11-degree Target Crown


Caliber.450 Bushmaster
Barrel Length16 inches
Barrel Twist Rate1:16 inches
Barrel Material4150 CMV
Muzzle Threads11/16×24
Barrel FinishBlack Nitride
Gas Block Size.875″ Gas Block
Barrel ProfileBig Gunner
Barrel Gas SystemCarbine
Gas Block Journal Length1.1 inches
Barrel ExtensionM4
Weight27.52 ounces

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Faxon Firearms Warranty

We do understand that life happens and that often a purchase will need to be returned. Customers may return any product, for any reason, in line with the requirements & policies below.

For any errors on Faxon’s part, after notification from the customer, Faxon will dispatch a Fed-Ex Ground label for the return of the product. Upon receipt and inspection at Faxon, a replacement will be sent to the customer via Fed-Ex Ground with tracking information sent to the customer.


  • Faxon will only refund products purchased directly through Faxon Firearms.
  • If you purchased a product through one of Faxon’s authorized dealers and would like to return the product for a refund, you must contact the dealer for your refund.
  • Merchandise must be in new condition with original packaging
  • Merchandise must be return-shipped in a protective box
  • A full refund including shipping if the return resulted from our error, otherwise we will deduct the shipping costs from the refund.
  • All product replacements done under warranty can be handled by Faxon directly.
  • The customer will receive a refund within 10 business days of our receiving your return. The refund issued in the same form of payment used for purchase.
  • No return will be granted for a product that is modified in any way
  • No returns for refund after 30 days from the delivery date of the product.
  • There will be a 15% restocking fee on all returns.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.