Upper Receiver Group – Improved, Geissele’s Perfect M4

Geissele, known industry wide for phenomenal trigger systems, won a contract with USSOCOM to field an upgraded version of the M4. More specifically the upper.

Geissele already has their Super Select Fire triggers running in several SOCOM M4’s as part of the SOPMOD. The military is playing a game of keep up with the Jones’… or maybe the Miculek’s.

3 Gun and the other high intensity shooter sports have pushed arms accessory development to incredible levels. Geissele has always been a warfighter centric company. They hold their products to that stringent level of possible abuse.

The URG-I features a number of upgraded items over the M4, M4A1, and the Block I and II upgrades currently fielded.

The barrel is an optimized design for the new M855A1 rounds. Standing up to the higher wear and tear the round puts on barrels. Additionally featuring the longer midlength gas system and a mildly overbored gas port. To assure reliability under harsh operating environments and smooth the recoil impulse.

The rail is the Mk16 13.5″, currently only available on the URG-I’s and one of the first fielded systems with the CRANE approved M-LOK mounting system in place of the traditional picatinny.

The barrel is topped with a Surefire 4 prong flash hider for interface with suppressors. Geissele dropped their DDC Airborne reduced profile ambidextrous variety charging handle in for good measure.

While it isn’t the lightest system utilizing M-LOK it is probably nearly the strongest. With the barrel nut interface and handguard design. Purpose built to bring the M4 into the next phase in it’s military career.

Mike over at GarandThumb has an in depth look at this new premium piece of AR-15 equipment.