Introducing Radical Firearms 450 Bushmaster Complete Upper. After a year of development, a few thousand rounds, and a pretty sore shoulder, we feel this is absolutely one of the best uppers we ever offered...This provides a high-quality upper for those looking for more POWER out of their rifle. Comes complete and assembled with Upper Receiver, Forward Assist, Custom Ejection Port Door, Barrel Nut. 16" 450 Bushmaster Barrel and our Panzer Muzzle Brake to take the bite out of the round. Bolt Carrier Group, Charging Handle.

16" 450 Bushmaster 4140V Steel Barrel
1 in 14" Twist Rate
5/8x32 TPI
Single Feed Ramp
.936" Micro Gas Block
Stainless carbine-length gas tube
Direct Gas Impingement
Radical Firearms Panzer 5/8x32 Brake
Radical Firearms 15" MHR Hybrid Rail System
Integrated M-LOK attachment points on the sides and bottom with Picatinny Rails at the fore end for Mounting Lights, Lasers, Bipods & Sights
Custom Forged Upper Receiver with RF Dimpled Forward Assist, Shell Deflector, Dust Cover
Complete 450 Bushmaster BCG, MPI, Melonite Coated, Staked
MIL-STD Charging Handle
(1) 450 Bushmaster Magazine



The Radical Firearms 7.5" 7.62x39mm HBAR Complete Upper is a law enforcement grade, drop-in solution for your next AR build. Crafted with quality materials and covered by Radical’s lifetime warranty, this MIL-SPEC upper receiver provides an outstanding solution for any budget. Arrives at your door with the hard work done. Finish the build with your favorite lower receiver and sights, then head for the range!

The Radical Firearms FCR system is a slim handguard that provides the weight savings you want without sacrificing any of the mounting possibilities you require. This freefloat design offers a monolithic Picatinny rail and plenty of M-LOK attachment points for all your gear.

NOTE: This upper receiver has a barrel that is less than 16” in length and is intended for use in AR pistol or legal short-barreled rifle builds. Other configurations may violate Federal law.


Barrel Length  7.5"
Barrel Material  41V50 Chrome Moly Vanadium Steel
Brand  Radical Firearms
Caliber Gauge   7.62X39mm
Gas System Length    Carbine
Gas System Type    Direct Impingement
Handguard: Radical M-LOK FCR Rail
Muzzle Device   A2 Flash Hider
Twist Rate   1:10

Call us for a quote or to purchase you favorite upper   512-461-3429


Radical Firearms 16" 450 Bushmaster Complete Upper with MHR


The Radical Firearms M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Upper Receiver, Forward Assist, Ejection Port Door, RF Barrel Nut. 16" HBAR Barrel and A2 Flash Hider. Our free-float handguard: FTR keeps your hands cool and provides plenty of room for M-LOK accessories. Complete upper including Bolt Carrier Group and Charging Handle.

16" HBAR 4150V Chromoly Melonited Barrel
1 in 10" twist rate
5/8x24 thread pitch
MPI 7.62x39 BCG
M4 Feed ramps
Low Profile Micro Gas Block
DGI Stainless Carbine-length gas tube
Direct Gas Impingement
MIL-STD A2 Flash Hider
Radical Firearms Free Float RPR rail (M-LOK)
Top Picatinny Rail
Allows for the use of M-LOK attachments on sides and bottom of rail
MIL-STD Forged Upper Receiver with Forward Assist, Shell Deflector
MIL-STD Charging Handle
Made in Houston, Texas U.S.A.!

RF Upper 16" 7.62x39 HBAR Complete Upper with 15" FTR

Radical Firearms 7.5" - 7.62x39mm 1:10 Carbine Length HBAR Complete Upper -