16" 450 Bushmaster Parkerized AR15 Rifle Upper Assembly with 12" Rail and Competition Muzzle Brake
The .450 Bushmaster is a rifle cartridge developed by Tim LeGendre of LeMag Firearms, and licensed to Bushmaster Firearms International. The .450 Bushmaster is designed to be used in standard M16s and AR-15s, using modified magazines and upper receiver assemblies. The .450 Bushmaster makes use of .452 in. bullets because of the lower impact velocities and energies would not adequately expand the heavier jacketed .458 in. bullets. Ballistically, the .450 Bushmaster has a rather flat trajectory out to 200 yards; if the firearm is zeroed at 150 yards, the user can expect to see a rise of 1.8 inches at 100 yards, zero at 150 yards, and a drop of 4.9 inches at 200 yards.
- 16" 450 Bushmaster 4150 Hardened Chrome Moly Steel Heavy Barrel with 1x24 Twist and 5/8x32 Threads. Proper single feed ramp for 450 Bushmaster cartridge. Parkerized finish.
- Milspec forged aluminum upper receiver with forward assist and dust cover assembly installed. Matte black hard coat anodized Mil 8625 Type 3 Class 2. One large single Feed Ramp for big bore cartridges. Forged from 7075 T6 aluminum. This receiver has been correctly modified around the ejection port to allow for clearance and proper ejection of the 450 Bushmaster cartridge.
- 12" Narrow Profile Free Float Rail. Very comfortable and very light weight. Your choice of M-LOK or KEYMOD attachment points along the entire length at 3, 6, and 9 positions.
- 0.875 low profile gas block.
- Carbine Gas Tube.
- Compact competition muzzle brake with crush washer.
- AR15parts will customize (to your specificaions in the drop down menu) your AR15 upper with the Rail Type (M-LOK or KEYMOD), a Magazine or two, one of our High Quality Bolt Carrier Groups, and your choice of 5 different Charging Handles.
This upper assembly will fit all standard AR15 lower receivers.
This item is considered "Firearm Parts", not a complete firearm (it has no serialized components). Therefore, it can be shipped directly to you with no FFL transfer required.
You are responsible for knowing federal, state and local laws that may be applicable to this item. AR15Parts.com reserves the right to not ship to addresses where it may not be legal to own this item.
ReviewsPhilipI have made multiple purchases from AR15part.com. Every purchase was perfect. All items were exactly as described. Everything arrived very promptly and it was very well packaged. I only wish all companies acted like thisPhilip
OUTSTANDINGI have made multiple purchases from AR15part.com. Every purchase was perfect. All items were exactly as described. Everything arrived very promptly and it was very well packaged. I only wish all companies acted like thisMaddux
.450great product. fast shipping. wonderful experience.Guy
450 Bushmaster upper assemblyVery satisfied with this upper. The slim hand guard is desirable to grab and grip, also to have the option to mount fold down sights. I wanted the option to add my own bolt assembly and this purchase had just that. If you're shopping for 450 BM upper, you won't be sorry with this one. It's worth every penny.Anonymous
Won’t be my last purchaseThis was a great purchase, fast shipping, especially during this time and considering uncertainty, I feel better having thisRhett Lee
Solid 450 bushmaster upperLove the upper, functions perfectly, no problems (I’ve only had it for a few weeks and haven’t even put 100 rounds through mine yet but it’s exactly what you’re looking for if you want a 16 inch bushmastermichael faupel
450 AR15 UpperExcellent product, better than expectedMichael Hawker
450 Bushmaster upperVery impressed with quality and value. Looking forward to trying it out. Would like a call back about maybe purchasing the bolt carrier group also. Your professional courtesy will be appreciated. Thanks.Reid Z
Shipping and InspectionShipping was very quick, however, I am local to the area if AR15part.com. Upon visual inspection, everything looks good. Coatings are uniform, barrel and handguard are tight, brake is properly clocked. Cleaned and oiled. Assembled to a lower, hand cycled rounds just fine. Plan to shoot in the next week or so and will peer-review with more actionable information.Jim Cooper
450 BushmasterReally fast processing and shipping
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DetailsCurrent Stock: 35SKU: UA45B16PA24B824C_12ML00_CBUPC:Availability: Usually Ships in 24 HoursOld SKU: 16450CMU1x24RLMLR