10.5" 5.56mm upper with 10" FQR
10.5" 5.56mm upper with 10" FQR

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MSRP: $259.95

Stock Status:Ready to build; check lead times
Availability: Current Production Time Up To 4 Weeks
Product Code: FU10.5-5.56M4-10FQR


The Radical Firearms 10.5" M4 profile 5.56mm is a MIL-STD upper ready to drop on any MIL-STD lower Receiver. Perfect for the novice or advanced shooter wanting to finish out that build and hit the range.Simply add your BCG,charging handle and you are ready to go. Built with our 10" FQR free float rail system for increased accuracy and keeping your hands cool. No matter what your style of shooting is, Radical Firearms has you covered.

SKU: FU10.5-5.56M4-10FQR
UPC: 814034024334
MFR#: RF00175

  • Barrel Length: 10.5"
  • Gas System: Carbine Length
  • Barrel Profile: M4 Profile
  • Barrel Material: 4140 Chrome Moly Vanadium
  • Barrel Finish: Melonite
  • Muzzle Thread: 1/2x28
  • Chamber: 5.56mm
  • Twist Rate: 1:7
  • Barrel Extension: M4 Feed Ramp
  • Gas Block Type: .750 Low-profile Gas Block
  • Muzzle Device: A2 Flash Hider
  • Upper Receiver Material: Forged 7075 T6
  • Upper Receiver Style: M4 Mil-Std
  • Upper Receiver Finish: Type III Anodizing
  • Forward Assist: Yes
  • Dust Cover: Yes
  • Handguard Type: Free Float
  • Handguard Style: Quad Picatinny Rail
  • Handguard Length: 10"

Average Rating: 5 of 5 Total Reviews: 5 Write a review »

  1 of 1 people found the following review helpful:
10.5 " upper GREAT BUY! August 2, 2016
Reviewer: Mc from Yuma, AZ United States  
I got great shipping time from RF, and this upper was nice. BCG went in nice fit perfectly and the charging handle fit like a glove but function was smooth. Nice build, came back to get a few more.

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  0 of 0 people found the following review helpful:
Quality Company and parts June 4, 2016
Reviewer: Joe from Belgrade, MT United States  
Quick shipping and fits perfectly. Will definitely be purchasing more products from Radical Firearms. A++

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  1 of 1 people found the following review helpful:
product and customer service December 21, 2015
Reviewer: MICHAEL O'SULLIVAN from DORCHESTER, MA United States  
This upper is a real value for this price point. A milspec upper made in the USA at a reasonable price in this era of vastly overpriced merchandise is at best a rare event.I must also applaud the staff at Radical for their customer service as well. When I ordered the item I was made aware that it could take 4-6 weeks to deliver as it was part of the "black friday" madness. I had no problem with that but my circumstances changed and I had to abruptly travel for work and would not be able to be available at the shipping address. The emergent nature of the move did not give me much time to make arrangements for alternative measures to complete the order. I contacted James at Radical and despite them being extremely busy they went out of their way to get the upper shipped before I had to leave. Thats what customer service is all about and they met the challenge.

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  0 of 0 people found the following review helpful:
Awesome upper October 13, 2015
Reviewer: Craig Reese from Greenbrier, TN United States  
I put this upper on a anderson lower that i built. The gun functioned flawlessly and was very solid with no wiggle between the lower and upper. Will definitely get another.

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  0 of 0 people found the following review helpful:
Great pistol upper May 10, 2015
Reviewer: Anonymous Person from Missouri, United States  
Fit and finish is perfect, their new rail system is rock-solid, and the quality is excellent overall. Drop this on any lower and you're good to go.

I mounted mine with a RF Melonite BCG, standard A2 and standard charging handle, to an Anderson stripped lower. Used Radical's excellent lower parts kit and pistol kit. It all works great. Accurate, loud and fun.

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