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, stripped in a shorter close-quarter battle rifle (CQB) configuration. 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 lotsa slots for other accessories. T-markings are engraved on the rail but not painted white to help keep the rifle unobtrusive.
*** Please Note: This is a stripped upper receiver group, and does not include a bolt carrier group, charging handle, or muzzle device. ***
Geissele Part 08-177
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