5.56 Custom Upper Builder

(3 customer reviews)

From: $419

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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3 reviews for 5.56 Custom Upper Builder

  1. Matt

    Great website. Easy to put together the components you need

  2. Steve Starnes (verified owner)

    Great components, great guy! I have 2 grendels and 1 5.56 all uppers from Grendel Hunter. I am extremely impressed with the quality of the products and the level of service provided! The turnaround time is superior to anyone else! The attention to detail is superior to anyone else! The accuracy if the 3 uppers I have is under 1/2 MOA at 100 yards! All chambers are on the snug side of tolerance. I suspect that lends to the accuracy I’m getting. I’m so pleased with the performance, I’m in the process of ordering another 5.56!

  3. Kyle Bush

    Easy to put together