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5.56 Custom Upper Builder

From: $399

The 5.56 Custom Upper Builder is perfect for customizing a new assembled upper to pin on your 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 or Satern’s Liberty Barrel
  • Grendel Hunter Upper Receiver – Black Anodized
  • Mil-Spec Forward Assist & Dust Cover
  • 12″ MLOK Grendel Hunter Hanguard – Black Anodized
  • 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.

Comes assembled 

Customize your kit with the options below

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