Geissele USASOC Upper Receiver Groups Now Available

by Pete

For those of you who are veterans of the Clone Wars – building visually and technically correct military rifles – or are just getting started, the previously announced Geissele USASOC upper receiver groups are starting to show up in the wild. For the moment, only the stripped version (no charging handle, BCG or flash hider) is showing in stock at Brownells, but the complete version can’t be far behind.

Additional information and specifications can be found below.

Geiselle USASOC Upper Receiver Group

Brownells: Build Your Rifle on the Upper Receiver Used By USASOC

The Geissele URGI AR-15 upper receiver is a near clone of the “Upper Receiver Group Improved” currently going into service with USASOC (United States Army Special Operations Command). It offers a host of improvements over the standard “mil-spec” M4 upper we’ve grown so accustomed to – and it will transform your AR-15 shooting experience. Brownells offers the Geissele URGI upper in “Stripped” form and a Complete model ready to snap onto the lower of your choice and hit the range. Let’s look at the Complete URGI first.

To begin, Geissele installs a 14.5″ Daniel Defense barrel optimized to handle the full rigors of the new M855A1 (AB57) ammunition, with a Surefire SF3P three-prong flash hider pinned up front. Functioning as a highly effective flash suppressor, the URGI’s SF3P three-prong flash hider also serves as a rock-solid adapter for a Surefire SOCOM 5.56 Fast-Attach sound suppressor (not included). In between, a mid-length gas system with low-profile gas block ensures more reliable cycling than a standard carbine-length tube.

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. The URGI Upper Receiver is also outfitted with Geissele’s ambidextrous Airborne Charging Handle, with easy-to-grasp levers that are deeply checkered to ensure a confident grip when you need to charge the chamber in a hurry.

Complete URGI upper receiver feature summary:

  • Core receiver with forward assist, shell deflector & ejection port cover
  • Daniel Defense 14.5″ barrel with 1-7″ rifling & 1/2″-28 tpi muzzle threads
  • Mid-length gas system with low-profile, stainless steel, Nitrided gas block (pinned)
  • Geissele MK 16 Super Modular Handguard
  • Pinned-and-welded Surefire SF3P three-prong flash hider
  • Geissele Airborne Charging Handle
  • Mil-spec M4 carbine bolt/carrier group
  • $1379 – Brownells

NFA DISCLAIMER/WARNING: The Complete URGI upper receiver contains a permanently pinned and welded muzzle device. This makes the muzzle device an integral part of the barrel to make the barrel meet the 16″ minimum length requirement, and requires no registration or tax stamp from the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE). Removal or modification to the muzzle device, will result in converting this item to a regulated item by the National Firearms Act (NFA). Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.

For shooter who want to do more customizing, the “Stripped” URGI upper receiver eliminates the bolt/carrier group, Surefire SF3P three-prong flash hider, and Airborne handle. Features it retains:

  • Core receiver with forward assist, shell deflector & ejection port cover
  • Daniel Defense 14.5″ barrel
  • Geissele MK16 Super Modular Handguard
  • Mid-length gas system with pinned low-profile gas block
  • $979 – Brownells

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6 of 73 comments
  • DisqueGuyOverHere DisqueGuyOverHere on Jun 08, 2018

    I'm asking this out of genuine curiosity, but how well do you guys think underbarrel grenade launchers like the M203 would integrate with M-LOK handguards?

    • See 2 previous
    • Friend Friend on Jun 10, 2018

      @DisqueGuyOverHere Yeahhhhh I say like 10 years maximum. There's a reason that idea stuck around as long as it did. Since they've made Picatinny mountable 203s, I bet someone somewhere is gonna make an M-lok mount 203 and just wait for someone in a special unit to complain and meanwhile the big military will just tell everyone "you can just UBGL the 320", and the old salts will reminisce on the glory days when the UBGL weighed half as much as the one they have now.

  • Spencerhut Spencerhut on Jun 09, 2018

    My 14.5" Daniel barrel is on the sideline while I wait for my SBR stamp, but other than that I already have almost this exact upper, better actually.

    • JohnB JohnB on Jun 09, 2018

      @Spencerhut It might be better but it’s not what the best of the best use