From: $359.00

The 5.56 Custom Upper Build Kit is perfect for DIY builders who like to assemble themselves and those who just want to pin a new upper on their lower. Designed as an à la carte package, you can choose each individual component to fit your style and needs. The base price includes the following:

• Rosco Barrel – Black Nitride
  • 16” M4 Profile 5.56 NATO
  • 4150 CMV
  • Carbine or Mid Length Gas
• Grendel Hunter M4E1 Upper – Black Anodized
  • AERO Precision Manufactured
  • Grendel Hunter Logo
• Mil-Spec Forward Assist & Dust Cover
• 12″ MLOK Grendel Hunter Hanguard – Black Anodized
  • Steel Barrel Nut
  • Mounting Hardware
• Low Profile Gas Block – Black Nitride
• Gas Tube (Length dependent on barrel selected) – Stainless Steel
• A2 Flash Hider and Jam Nut – Black Nitride

NOTE: The 11″ handguards will cover a Carbine length gas system, but not a Mid Length. Other lengths will cover both. 

Customize your kit with the options below