URGI

URGI / URG-I (Upper Receiver Group Improved) is a modernized version of the upper receiver of the M4 carbine, developed by Geissele Automatics for the U.S. military special forces, particularly USSOCOM (United States Special Operations Command). This system is also referred to as MK16 Mod 0 and was designed as a universal platform for various combat situations, enhancing the features of the original M4. If you are looking for a URGI MK16 rifle, noteworthy versions include those from Arcturus, Specna Arms, VFC, GHK, or the NGRS variant from Tokyo Marui. Alternatively, you can purchase just the handguard from Angry Gun.

What is URGI?

Upper Receiver: URGI includes the upper part of the weapon (upper receiver), including the barrel, handguard, and other components.
Geissele SMR (Super Modular Rail) Handguard: A modular M-LOK handguard that is lightweight, durable, and compatible with modern accessories.
Barrels: The standard barrel length is 14.5 inches, with the option to use a suppressor.
Versatility: URGI is designed for use in various climatic and combat conditions, from deserts to jungles.

How does the MK16 (URGI) differ from the M4 and M16?

Model	Main Features	Differences
M16	A long assault rifle with a 20-inch barrel, NATO standard 5.56x45mm. Designed for accuracy at longer distances.	The longer barrel provides higher muzzle velocity but is less suitable for CQB (Close Quarters Battle). Older design without modular options.
M4	A carbine version of the M16 with a shorter 14.5-inch barrel. Compact and lighter, ideal for CQB.	Shorter barrel reduced muzzle velocity but improved maneuverability. The original model lacked modern modular handguards (Picatinny or M-LOK).
MK16 (URGI)	A modernized M4 with an improved upper receiver (URGI). Uses a Geissele SMR handguard and modern accessories.	Modular system allows the mounting of M-LOK accessories. Improved durability and ergonomics. Better compatibility with suppressors.