Geissele Upper Receiver Group, URG-I "near clone" built by Potomac Armory (2024 vintage)

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 14.5" Government profile barrel and Surefire muzzle device

This model based off the original Geissele near clone correct upper.  Charlie's had worked closely with Geissele to bring this to market in 2018.  Now this is being built as issued by Potomac Armory.

Your choice of various Surefire muzzle devices will be installed and pinned and welded as ordered.

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.

Charlie's is working with Geissele and Potomac Armory to bring you a near clone version of the US Army's URGi upper replacement for the M4A1.   This is very much the same offering that Geissele produced in 2018, which was a commercial variant of the Army's URGi, an like Geissele's model in 2018, Potomac in 2024 is producing a build that is also extremely close.  The major difference between the clone and near-clone upper receiver groups has to do with the upper receiver, barrel, BCG and gas block.  The clone correct builds use Colt upper receivers and BCGs and NAVSEA approved gas blocks and the Daniel Defense barrel.  The near clone builds by both Geissele and Potomac Armory use military grade contracted mil-spec upper receivers and military grade phosphated and chrome lined BCGs, and your choice of a Geissele or an FN chrome lined phosphate coated barrel. 

Depending on availability, Potomac Armory will build this upper with one of the following barrels: FN 14.5" mid-length button broached barrel with Government profile, or a Geissele CHF mid-length barrel with a mid-weight Geissele proprietary profile.  If you have a preference, add a note to your order, otherwise, Potomac Armory is building with the barrel that is most available at the time.  Both are very good quality barrels, and have the same steel alloy, phosphate exterior, chrome lining and 1:7 twist.

Highlighted in the URGI uppers is a mid-length gas system.  This is the first time the mid-lenght gas was used on a military rifle, and the service personnel shooting the URGI have been treated to a softer and more predictable shooting experience.

Highlights:

• Mil Spec M4 receiver hard coat anodized in black mil-spec 7075 aluminum with upper Picatinny rail T-marked engraved to match the Geissele Mk16, includes shell deflector & ejection port cover, contracted from tier-1 manufacturer by Potomac Armory
• Geissele Mk16 Super Modular Handguard hardcoat mil-spec anodized in DDC with Geissele roll-marks and upper Picatinny rail T-marked engraved without painting to match the quality mil-spec upper receiver.  This Mk16 will come with embossed Geissele name on roll-marked NSN number.
• 14.5" mid-lenght CMV 4150 steel barrel with 1-7" rifling & 1/2"-28 tpi muzzle threads, chrome lined and mil-spec phosphated exterior.  Geissele CHF or FN buttoned barrels are used.
• Geissele Airborne DDC charging handle - military version with roll-marks
• LPGB - pinned into the barrel, per SOCOM standard
• Mil Spec M16 bolt and carrier group, contracted by a tier 1 manufacturer by Potomac Armory
• Surefire SOCOM muzzle device, pinned and welded to the barrel, pinned and welded in place by one of the best pin and weld shops in America (you might notice the weld)

Depending on availability, Potomac Armory will build this upper with one of the following barrels: FN 14.5" mid-length button broached barrel with Government profile, or a Geissele CHF mid-length barrel with a mid-weight Geissele proprietary profile.  If you have a preference, add a note to your order, otherwise, Potomac Armory is building with the barrel that is most available at the time.  Both are very good quality barrels, and have the same steel alloy, phosphate exterior, chrome lining and 1:7 twist.

What, you ask, is the difference between this URGI and the URGI that Geissele is producing?  The Geissele factory build is very similar.  A Geissele BCG and gas block is found on the Geissele factory build, and you do not have a choice of flash hiders.  Other than that, they are about the same.  You get the potential choice of an FN barrel with the Potomac build and you get a military spec upper receiver, similar to Colt and FN, and Geissele gives you a commercial grade Super Duty upper.

A note on Surefire muzzle devices:  All the Surefire muzzle devices will accept a Surefire SOCOM series suppressor, like the RC2 and Mini2. While the Warcomp will work with and fit the SOCOM suppressor series, the nature of the ports on the Warcomp may lead to less noise being suppressed, and higher back pressures in the suppressor, while not a problem, this does make the Warcomp more suitable for unsuppressed fire.  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

Note on pin and welded muzzle devices:  Pinned and welded muzzle devices result in a barrel with an overall length of 16" or more, making the attachment of the upper receiver group to a lower receiver a "street legal" rifle and not a short barreled rifle, subject to the National Firearms Act.

To view the Geissele factory production URGI, click this link:  Geissele Factory Production 14.5" URGI near clone . 

To view the Clone Correct version, click this link:  Clone-Correct 14.5" USASOC URGi upper receiver group.

NFA Comment:  The 14.5" barrel is pinned and welded to make the barrel length compliant with the National Firearms Act, and is not a short barreled upper.  Removal of the pinned flash hider, or attaching a flash hider that is not pinned and welded will result in the upper being an NFA item, when attached to a lower receiver.

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.