M4A1 Geissele Upper Receiver Group, USASOC URG-I, CLONE CORRECT, 14.5"pinned flash hider

$1,599.00 - $1,699.00
Assembled to Order, Ships in 3 to 7 weeks

Geissele Upper Receiver Group, USASOC URG-I with pinned flash hider

This is for the PINNED Surefire flash hider.  Now available in SOCOM WarComp 3-prong, SOCOM WarComp Closed-Tine or Fast Attach 4-prong.

The US Army Special Operation Command is changing out the M4 upper receivers with this new improved model, which features the Geissele Mk16 DDC rail, and a Daniel Defense 14.5" Government profile mid-length barrel

This model is the Geissele clone correct upper.  Charlie's has worked closely with Geissele to bring you what you are looking for.  

Each URGI is fitted with the handguard Geissele designed specifically for USASOC, the MK 16 M-LOK™ Super Modular Rail handguard with a full-length Picatinny top rail and lots of slots for other accessories. T-markings are engraved on the rail but not painted white to help keep the rifle unobtrusive.


  • Colt M4 receiver with forward assist, shell deflector & ejection port cover, currently sourcing Colt key-hole (Cerro) forged upper receivers without CAGE Code markings, and Colt square (Brass Aluminum) forged upper receivers with CAGE Code markings.  Both are identical in construction with M4 feed ramps and interior dry lube treatment.  The CAGE Coded uppers are available at small additional premium, as Colt is sourcing both receivers and both arrive to us as Genuine Colt, but the CAGE Code marked in smaller numbers.
  • Geissele Mk16 Super Modular Handguard with Geissele roll-marks
  • military grade barrel chrome-lined and phosphated steel 14.5" CHF barrel with 1-7" rifling & 1/2"-28 tpi muzzle threads and mid-length gas system, currently sourcing FN and Daniel Defense 14.5" mid-length barrels and Daniel Defense Carbine length barrels.  Check with a Charlie's team member for which barrel is available at the time of your order
  • Geissele Airborne (military version with roll-marks) DDC charging handle
  • Mk12 gas block
  • Colt M16 bolt and carrier group
  • Surefire flash hider, pinned and welded, with your choice of SOCOM WarComp 3-prong, SOCOM WarComp Close Tine or Fast Attach 4-prong

Note:  if you select WarComp, we time this as neutral (ports pointed up).  If you want it timed to the starboard side, please make sure to put that in the comments.  Both are correct.  Our gunsmiths prefer ports timed up.

Production note In 2018 Geissele was manufacturing this, but stopped offering the clone-correct URGi.  In 2020, Potomac Armory took over the build from the exact same components that Geissele used:  factory Geissele, Surefire, Colt and Daniel Defense parts.  All the same product, but not shipped in a Geissele box, as this is no longer a Geissele factory product.  Potomac Amory and Charlie's Custom Clones are factory dealers and OEM (original equipment manufacturers), and are using 100% authentic parts, and nothing fake substituted.

Note:  This barrel, with a pinned and welded flash hider will measure over 16" so it will be "street legal," and will not require NFA registration as an SBR when mounted on a lower receiver as a rifle.

Note on Surefire muzzle devices:  The SOCOM versions of flash hiders will support the Surefire SOCOM family of supressors.  The FAST ATTACH flash hider will support only the FAST ATTACH family of suppressors (SureFire FA556K, FA556-212, FA556MG, or MINI), suppressors, which are legacy products.  All new production Surefire suppressors are SOCOM (RC1, RC2, Mini), so if you intend to attach a Surefire suppressor, make sure the mount you choose is compatible with the suppressor you have or plan to buy.  Also, any of the Surefire muzzle devices will fully funtion without a suppressor.

Note on pictures:  The pictures below contain shots of pre-production prototypes, as well as versions that may have been offered in the past and are no longer offered.  Charlie's updates pictures from time to time.  Please refer to the specifications above, which are the most accurate we have at this time.