Radical Firearms 8.5" 300 BLK Complete Upper Pistol Length - M-LOK FCR Rail
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.
- 8.5" 41V50 chrome moly vanadium steel HBAR contour barrel
- Chambered in 300 BLK with a 1:8 twist rate
- M16 cut bolt carrier group with Melonite finish
- BCG high pressure tested and magnetic particle inspected
- Standard charging handle
- 5/8x24 A2 flash hider
- 7" Radical Firearms M-LOK FCR rail
- Gen 3 rail mounting system
- Made in the U.S.A. in Stafford, Texas!
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.
Ratings & Reviews
Check your barrel
by JAMEY -
Check your barrel. I ordered 2. One had an 1:8 twist, one had 1:7 twist
Poor upper machining
by Mal -
The machining on the upper was very poor. The takedown pin holes were misaligned on front and rear. It would need to have about 1/32 taken off both sides of the rear mounting block just to properly seat into any of the 3 lowers I have. It seems to be a good barrel and guard. Not so sure the upper was machined well.
better the 2nd time
by JB -
After the initial issues where I was sent 2 uppers with 2 different barrels, I have had good results with my original 1:7 upper. I haven't shot the replacement upper, but it looks fine cosmetically
It just runs and runs
I already have the 5.56 version of this upper and now I have the 300 BLK version. So far 800 rounds, no malfunctions. It is running flawlessly with a Spike’s Tactical lower. My favorite thing about this entire upper is how the M-LOK free-float rail feels as if it were designed to accommodate a Magpul AFG-2 angled foregrip. It fits like a glove and makes for such a cool and clean look that sets it apart from the others. Plus this makes it incredibly ergonomic and comfortable to handle.