Daniel Defense’s M4A1 FSP Upper Receiver Group was inspiered by the USSOCOM SOPMOD Block II, and comes packed with Daniel Defense exclusive features. The upper receiver is MIL-SPEC with indexing marks and M4 feed ramps, and is constructed from CNC Machined 7075-T6 aluminum. The Barrel is cold hammer forged and is chrome lined, while the Gas System is carbine length and is direct impingement. The barrel also features SureFire’s SF3P Flash Hider: an advanced muzzle device that can reduce muzzle flash by an astounding 99% and also serves as a rock solid mounting adapter for SureFire’s SOCOM Fast Attach Suppressors. Other features include a Bolt Carrier Group with chrome lining and an M16 profile, and a Daniel Defense M4A1 FSP Rail Interface handguard with four picatinny rails in the 12 o’clock, 3 o’clock, 6 o’clock, and 9 o’clock positions.

Features of the Daniel Defense M4A1 FSP Upper Receiver Group:

• Quad-rail handguard
• SureFire SF3P Flash Hider
• Daniel Defense M4A1 FSP Rail Interface handguard