M4 CQB Mk18 Upper Receiver Group Geissele URGi

$959.99 - $1,249.00
Temporarily Discontinued, not taking wait list orders

Geissele M4 CQB Upper Receiver Group (URGi)

What if you took a look around and Geissele made a smaller brother to the M4 URGi, and what if it happened to be 10.3" and someone called it a Mk18 Mod X.  We don't know either. 

This model is the Geissele near clone correct upper, in a shorter close-quarter battle rifle (CQBR) configuration.  Charlie's has worked closely with Geissele to bring you what you are looking for.  

Your choice of the Surefire 4-prong flash hider, or other great Surefire, Colt, BE Meyers and KAC flash hiders.

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 lotsa slots for other accessories. T-markings are engraved on the rail but not painted white to help keep the rifle unobtrusive.


  • Mil Spec M4 receiver with forward assist, shell deflector & ejection port cover
  • Geissele 9.3" Mk16 Super Modular Handguard with Geissele roll-marks
  • Daniel Defense 10.3" CHF barrel with 1-7" rifling & 1/2"-28 tpi muzzle threads and carbine length gas system
  • Geissele Airborne (military version with roll-marks) DDC charging handle
  • Geissele Super Gas Block, black nitrided and pinned
  • Mil Spec M16 bolt and carrier group
  • Geissele Super 42 braided wire carbine spring and Geissele branded H-1 buffer
  • Surefire SOCOM 4-prong flash hider or the Surefire SOCOM 3-prong WarComp (un-pinned), as well as other popular choices
  • Surefire certificate for 30% off on SOCOM mil-spec NSN suppressor
  • Surefire certificate for 30% off on select Surefire light

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.

NFA warning:  The Stripped URGI upper receiver group without the pinned flash hider does not meet the 16" minimum barrel length requirement, and requires registration and a tax stamp with the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) when assembled into a complete rifle.  Please make sure you fully understand NFA and local laws.

ITAR warning:  This item may only be purchased and shipped to US Persons within the USA.  This is a military item, which is restricted from export without US Government permission.

Pictures courtesy of Geissele Automatics, Potomac Armory and Southern Cross, LLC


Also see the Count Blemula special Mk18 URGI here