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