10.5" 5.56mm upper with 10" FGS
10.5" 5.56mm upper with 10" FGS

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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: FU10.5-5.56M4-10FGS


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" FGS 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: FU10.5-5.56M4-10FGS
UPC: 814034024327
MFR#: RF00174

  • 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: Magpul MOE Round Rail
  • Handguard Length: 10"

Average Rating: 4.5 of 5 Total Reviews: 3 Write a review »

  1 of 1 people found the following review helpful:
Took a few tries, works now July 26, 2017
Reviewer: Craig from Beaverton , OR United States  
Had a few issues initially, but after warranty work and different bolt parts, its working now.  It didn't like my RRA bolt with Tubbs extractor/ejector spring upgrade.  It works with a stock PSA bolt/m16 carrier and H buffer.

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  0 of 0 people found the following review helpful:
Above and Beyond Service May 3, 2017
Reviewer: don arndt from west bloomfield, MI United States  
Just wanted to stop by and say thanks to James and everyone there. I had ordered this upper to use with my RFA 300 Blk Out to be able to practice with cheaper ammo. I made an error in ordering and everyone was great. No hassle, just made it right for me. My fault they did not have to. The quality and look can only be described as unbelievable. Then add the price point and cant be beat. One thing that you don't get in sub $1000 guns is a quality tight quality fit. Well with Radical you do. Everyone at the range comments on how well it fits together. No rattles! This upper snapped right in and just as tight as the original.

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  1 of 1 people found the following review helpful:
Great quality and fast shipping October 10, 2016
Reviewer: Craig Smith from Bellevue, NE United States  
Excellent quality and finish, super fast shipping. I was actually very surprised at the quality upon opening the well packed box considering the low cost. Highly recommended!

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