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RF Upper 10.5" 5.56 M4 Profile RF Round Rail: FGS 10" rail
RF Upper 10.5"  5.56 M4 Profile RF Round Rail: FGS 10" rail

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MSRP: $249.95

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

***Please select your options on the right hand side for BCG, Charging Handle, and other choices***

The Radical Firearms M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any MIL-STD 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, Barrel Nut. 10.5" M4 Profile Barrel and A2 Flash Hider. Our free-float handguard: Forward Guard Shield (FGS) keeps your hands cool and provides plenty of room for accessories. The FGS rail even has the capability to add attachments other than on the top picatinny rail, as it does allow Magpul Moe attachments and RF Rail Sections. Bolt Carrier Group and Charging Handle are additional and are offered at discounted prices in the drop down menus.

  • 10.5” 4140 Chromoly Barrel With Melonite Coating
  • 5.56 M4 Profile
  • M4 Feed Ramps
  • 1:7 Twist Rate
  • A2 Flash Hider
  • 1/2x28 TPI
  • Low Profile Gas Block
  • Carbine Length Gas System
  • Radical Firearms Forged MIL-STD Upper Receiver
  • MIL-STD Upper Parts Kit
  • RF Dimpled Forward Assist
  • Radical Firearms 10” FGS
  • Attachment Slots accept either Magul MOE attachments, or our RF picatinny rail sections (FGS-A)
  • Made in Houston, Texas U.S.A.!

  • 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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