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

$1,629.00 - $1,669.00
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 and Colt Receiver

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.  Colt is sourcing both receivers and both arrive to us as Genuine Colt, but the CAGE Code marked in smaller numbers.  If you have a preference, put it in the comments at check-out
  • Geissele Mk16 Super Modular Handguard with Geissele roll-marks in DDC
  • 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 mid-length barrels and Colt Carbine length barrels.  Check with a Charlie's team member for which barrel is available at the time of your order.  Barrels continue to be a bottle neck in the firearms supply chain.
  • 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 Surefire SOCOM 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. In 2021, the Daniel Defense barrels became impossible to obtain, and FN and Colt barrels have been substituted.  Note:  All three barrel makers are using the same 4150 CMV phosphated coated steel, the same chrome-lining.  These are all military grade barrels.  Colt barrels may have a small groove in front of the gas block, as many Colt barrels come to us with front sight posts which are drilled through the bottom part of the barrel.  All taper pin holes are chemically treated to blacken and protect the barrel, and this method of using barrels is quite common in the US military.

Note for barrels, either carbine or mid-length are perfectly fine.  Ask your Charlie's team member which are being used when you make your purchase.  At times, we will only have one choice.  Other times, we will have the mid-length or the carbine to choose from.

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 suppressors.  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 function 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.