A SOCOM barrel for an AR-15 is designed differently from the standard M4/A2 barrel.

Instead of being consistently thick throughout, it has a thinner section past the gas block and a thicker section near the chamber. In addition, SOCOM barrels often have a slot for attaching a grenade launcher and provide a balance between strength and weight.

If you’re looking for a barrel that can handle sustained shooting while still being lightweight, a SOCOM profile barrel may be a good option for you. The SOCOM-profile barrel is just a M4 barrel with a heavy configuration behind the gas block (and notches for a grenade launcher).  It was developed because it was found that M4 carbine barrels tended to rupture just aft of the gas block when the carbine was used for a prolonged period on full auto (such as when SOCOM units would break contact by essentially trying to use the M4 carbine as a machine gun).

This has the side benefit of stiffening the barrel and SOCOM-profile barrels tend to shoot tighter groups than M4-profile barrels

The Radical Firearms 16" SOCOM profile 5.56mm is a MIL-STD upper ready to drop on any MIL-STD lower Receiver. Perfect for the shooter wanting to finish out that build and hit the range. BCG,charging handle included and are ready to go. Built with our 15" RPR 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. BCG is a Toolcraft full auto rated with a lifetime warranty from Toolcraft.

I only have a handful of these at this blow out price. This is a light weight upper due to the barrel and RPR light weight barrel. 

SKU: FU16-5.56SOC-15RPR
UPC: 816903027729
MFR#: RF00207

  • Barrel Length: 16"
  • Gas System: Medium Length
  • Barrel Profile: SOCOM 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: M-Lok Thin Rail
  • Handguard Length: 15"