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Geissele URGI 14.5" Upper Receiver Group "near clone" from Potomac Armory - 2024 build

$1,069.95 - $1,359.99
SKU:
G0815920
Availability:
build to order
Built to Order:
anticipate 4 to 6 weeks to ship
Geissele Upper Receiver Group, USASOC URG-I, "near clone"

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The Geissele URG-I "near clone" 14.5-inch upper receiver group in 5.56 NATO — the standard-length URG-I configuration, built by Potomac Armory in 2024 with Geissele Mk16 DDC rail and buyer's choice of SureFire muzzle device, pinned and welded.

  • Geissele Mk16 Super Modular Rail, 13.5-inch, DDC: the M-LOK handguard specified in the USASOC URG-I program, with T-markings engraved
  • 14.5-inch barrel, 5.56 NATO, 1:7 twist: FN or Geissele CHF barrel (availability dependent), chrome-lined, phosphate exterior, mid-length gas system
  • SureFire muzzle device pinned and welded: buyer's choice of WARCOMP, 3-prong, 4-prong, or closed-tine — achieving 16-inch OAL for non-NFA compliance
  • Geissele Super Charging Handle and mil-spec phosphated BCG included

The URG-I — Upper Receiver Group, Improved — is the USASOC-adopted upgraded upper for the M4A1 carbine, fielded beginning around 2018. The program specifies a Geissele Mk16 DDC rail, a Daniel Defense cold-hammer-forged 14.5-inch barrel, a SureFire WARCOMP muzzle device, a mid-length gas system, and a low-profile gas block. The 14.5-inch configuration is the standard-issue length — the first time SOCOM adopted a mid-length gas system on a combat carbine upper, reducing bolt carrier velocity and improving the recoil impulse over the carbine-length M4A1.

This Potomac Armory "near clone" build uses the same Geissele Mk16 DDC rail and SureFire suppressor interface as the issued upper. The differences from a contract-issued URG-I are in the receiver, barrel, BCG, and gas block: the program-issued upper uses a Colt-forged receiver, a Daniel Defense CHF barrel, a Colt BCG, and a NAVSEA-approved gas block. The Potomac Armory build substitutes a military-grade mil-spec forged upper, an FN or Geissele CHF barrel (both chrome-lined, phosphate-coated, 1:7 twist, same 4150 CMV steel alloy), and a military-grade phosphated BCG. Both barrel options are quality matched — FN is the barrel supplier for the US military's M4A1 and M16A4 contracts; Geissele's proprietary mid-weight profile is their own design.

Charlie's Custom Clones worked directly with Geissele to bring the first civilian URG-I to market in 2018. The Potomac Armory 2024 build continues that lineage — same design intent, current-production components, built to the same standard that made the original CCC/Geissele collaboration the reference point for the commercial URG-I market.

The SureFire muzzle device is pinned and welded by Potomac Armory before shipping, bringing the overall barrel length to 16 inches for non-NFA compliance. All SureFire options support attachment of a SureFire SOCOM series suppressor.

We've been building URG-I uppers since the program went commercial. If you have a barrel preference (FN or Geissele), add a note to your order — otherwise Potomac Armory builds with whichever barrel is most available. Order yours today — we'll get it out the door fast.