+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

American Tactical Imports AR-15 Complete Upper, 450 Bushmaster ATI15MS450BM Caliber: .450 Bushmaster, Barrel Length: 16 in, 26% Off w/ Free Shipping

American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
1 of 3 images
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
2 of 3 images
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM
3 of 3 images
American Tactical Imports 450 Bushmaster Upper 16 inch, BBL Parkerized 15 inch Keymod Rail, Black, ATI15MS450BM

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
Who makes the BCG? Expert Answer

The American Tactical Imports AR-15 Complete Upper includes a black nitride finished BCG from American Tactical.

by Ethan, Gear Expert, June 30, 2022
will this fit on ar 15 multi cal lower Expert Answer

Yes it will.

by Nick B., Gear Expert, November 17, 2021
View All Q&A You Have a Question? Ask!
Caliber: .450 Bushmaster Barrel Length: 16 inMuzzle Device: Flash Hider Finish: Matte Color: Black Handguard Length: 15 in

Code: AT4-URC-ABU16KR-ATI15MS450BM

MPN: ATI15MS450BM

UPC: 819644020288

List: $469.95Save 26%
$349.49

Product Info for American Tactical Imports AR-15 Complete Upper, 450 Bushmaster

450 Bushmaster caliber upper receiver. 16in barrel 1:24 twist with 15in Keymod rail and 5/8x32 flash hider. Nitride bolt carrier group.image

Browse and shop all of our 450 Bushmaster Upper Receivers today!

Specifications for American Tactical Imports AR-15 Complete Upper, 450 Bushmaster:

Manufacturer: American Tactical Imports
Caliber: .450 Bushmaster
Barrel Length: 16 in
Muzzle Device: Flash Hider
Finish: Matte
Color: Black
Handguard Length: 15 in
Gun Rail: KeyMod
Gun Model: AR-15
Magazine Included: No
Last Chance: Yes

Features of American Tactical Imports American Tactical Milsport Rifle Upper .450 Bushmaster 16 Barrel Black with 15 Free Foad MLOK Handguard:

  • Forged aluminum Mil-Sport AR-15 pattern upper receiver
  • 16" barrel with 1:24 button cut rifling and black nitride finish
  • Chambered for 450 Bushmaster
  • 15" aluminum free floated key-mod rail system
  • Carbine length low profile DGIS gas system
  • A2 style compensator

Package Contents:

  • American Tactical Imports 450 Bushmaster Upper 16 inch BBL Parkerized 15 inch Keymod Rail

What firearm models does the manufacturer say American Tactical Imports AR-15 Complete Upper, 450 Bushmaster is compatible with?

The manufacturer suggests that American Tactical Imports AR-15 Complete Upper, 450 Bushmaster is compatible with AR-15

American Tactical Imports AR-15 Complete Upper, 450 Bushmaster Orderable Models

List of Orderable Models

  • American Tactical Imports AR-15 Complete Upper, 450 Bushmaster, 16in Barrel, Parkerized 15in Keymod Rail, Black, ATI15MS450BM , MPN: ATI15MS450BM , UPC: 819644020288 , Code: AT4-URC-ABU16KR-ATI15MS450BM
Compare (0)
1 item has been added
Add at least two items to compare