Get a high powered firearm that will deliver your tightest groupings yet when you build your rifle with the Radical Firearms Complete Upper Assembly .450 Bushmaster. These AR15 Upper Receivers by Radical Firearms come complete and assembled so that you don’t have to fidget around with parts or waste time building. The Radical Firearms Upper Assembly w/ MHR comes with an upper receiver, forward assist, custom ejection port door, barrel nut, 16in 450 Bushmaster barrel, Panzer muzzle brake, bolt carrier group, charging handle, and a 450 Bushmaster mag. You won’t find a better collection of parts for this great of a value anywhere else on the market. Plus, you can utilize the M-LOK attachment points on the sides and bottom or the Picatinny rails at the fore end to mount optics, lasers, lights, bipods and other accessories to customize your rifle to its fullest potential. Pick up your Radical Firearms .450 Bushmaster Full Upper Assembly today to build a powerful rifle that will deliver optimum performance for life. Specifications for Radical Firearms Complete Upper Assembly .450 Bushmaster, 15in MHR, Single Ramp, Black, Box: Manufacturer: Radical Firearms Cartridge: .450 Bushmaster Gas System Length: Mid Length Barrel Twist Rate: 1-20 Threads per Inch: 5/8×32 Handguard Type: Free-Float Muzzle Device: Panzer Brake Finish: Anodized Color: Black Model: 15in First-Gen Hybrid Rail System – FHR Gas Block Journal Size-Diameter: .936 in Handguard Length: 15 in Handguard Style: Hybrid Rail Gun Rail: M-LOK Magazine Included: Yes Features of Radical Firearms Complete Upper Assembly .450 Bushmaster, 15in MHR, Single Ramp, Black, Box: Barrel Profile: Big Bore Profile Barrel Material: 4140 Chrome Moly Vanadium Barrel Finish: Melonite Barrel Extension: Single Feed Ramp Gas Block Type: .936 Low-profile Gas Block Upper Receiver Material: Forged 7075 T6 Upper Receiver Style: M4 MIL-STD with Oversized Ejection Port Upper Receiver Finish: Type III Anodizing Forward Assist: Yes Dust Cover: Yes Charging Handle: MIL-STD Bolt Carrier Group Included: Yes BCG Finish: Nitride Magazine: 450 7 Round * Includes 1 Magazine Package Contents: Radical Firearms Complete Upper Assembly .450 Bushmaster, 15in MHR, Single Ramp, Black, Box
6 reviews for Radical Firearms Complete Upper Assembly .450 Bushmaster, 15in MHR, Single Ramp, Black, Box
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Skipper –
My 3rd Radical Firearms upper. So far so good. BCG is a bit tight but should break in in a few more boxes of ammo. This IS a round you want to reload since finding factory ammo is kind of hit and miss. Recoil is pretty much a lot less than I was expecting. Read in most places that the .450 Bushmaster is like shooting a 20 ga. It feels a little more than a .300blk than a 20 ga. Brake isn't obnoxiously loud. Fit right on the lower without a problem. 1st box of ammo couldn't test the feeding from the mag since I had to single load it (range rules). Did have it short stroke a couple times and close instead of locking back. Something that should clear up after another box or two.The handguard I'm not to crazy about. Has a metal mesh "feel" to it. Also the rail on the handguard where it meets the upper is a little fatter than the upper's rail and wouldn't let me slide the scope mount over it from the back. Had to slide it on from the front.
Backfat –
I shot 2 boxes and it never ejected 1 shell. Sent it back and went with a different brand. Took a full 20 days to get and then it didn’t even work . I almost missed my hunting season waiting for this and then it not working and waiting for a new one to arrive. Everything else on it seemed good it fit on correctly and was tight it didn’t have any slip in it
Jesse –
For the price of this upper I was a little concerned that the quality would not be there. I'm glad to say I was wrong. This is a great upper at a great price. Had it sighted in with 6 shots and killed a deer with the 7th. I definitely recommend this for anyone wanting a 450 in an AR platform.
Rusty Longiron –
Just finished assembling the rifle. Gave it just a quick test fire off the deck. It fed, fired and ejected which is a good start. I had to use a standard 20 round 223 mag because for reasons I'm still waiting to find my upper did not have the 450 mag in the package. As for accuracy, I'm waiting for the weather to clear before I can comment on that.
Pickalo –
Very easy to order. Product operated perfectly. Was able to track shipment and new when it was going to arrive. I would recommend radical firearms 450 Bushmaster complete upper to any one. The pricing was very comparable and shipping was great. Getting to the web site was very easy and ordering was a breeze
Ray –
Received the upper after some delay (10 weeks). Fits well on the lower, bolt is a little stiff, but workable after cleaning. Firing at the range, it is very accurate. However, the fired cartridges will not extract, basically have to disassemble the rifle after every shot and tap the bolt back to get the case out. I have found that if I take the spent cases, and clean the soot off, they will extract with some resistance manually. No problems feeding or extracting unfired rounds. So, before I give up, I will keep cleaning and scrubbing the chamber. For hunting season, I think I could only count on it as a single shot rifle.