The Geissele Mid-Range Gas Gun (MRGG) was born from the Very Long-Range Semi-Automatic Sniper System (VSASS) program. Officially adopted and battle-proven by U.S. SOCOM as the Geissele MK1 MOD0 (MRGG-S), the Geissele MRGG MK1 brings this technology to the modern shooter, who demands uncompromising performance and precision.
 
Built from the ground up, the MRGG MK1 combines Geissele’s patented Phased Array® with Geissele Tri-Port™ Gas System, in-house Match Grade Cold Hammer-Forged Barrel technology, and fully ambidextrous controls to deliver a precision rifle greater than the sum of its parts. Engineered and hand-assembled by Geissele craftsmen for industry-leading accuracy, reliability, and a remarkably smooth shooting experience, it features a proprietary bolt group, and tuned buffer system to reduce felt recoil and enable faster follow-up shots. Whether in the field or on the competition line, the MRGG MK1 excels when every round matters.
 
The MRGG MK1 includes the attention to detail expected from world-class Geissele manufacturing.
 
For those who refuse to compromise, the MRGG MK1 sets the standard for flawless performance. Join the legacy of Geissele precision, reliability, and unmatched craftsmanship—and equip yourself with the rifle that defines excellence as the benchmark for success.
Match Grade Cold Hammer-Forged Barrel – Flawlessly crafted in-house in North Wales, PA, delivering bolt-gun accuracy with gas-gun speed.
Aluminum Billet Receiver Set – Steel-reinforced cam race and intuitive ambidextrous controls, including a dust-cover-actuated bolt catch and rearward release button for faster, instinctive reloads.
MRGG SSA-E Two-Stage Trigger – Absolute reliability and precise control in the harshest environments, trusted by professionals in combat and competition.
Nanoweapon®-Coated Reliability Enhanced BCG – Forged Carpenter 158+ bolt for unmatched durability under high round counts, exclusive to Geissele.
 
Sellers Build Notes: For this build we tried to stick to how the authentic SOCOM Military Ops would operate the gun. This rifle is build to be a precision AR10 Platform that can shoot accurately to engage targets out beyond 1000 yards, which is why the SOCOM selected this rifle in the first place. The action is semi automatic, however the accuracy is insanely good or better than most bolt guns! We started by using a Huxwrk Flow 762 can on the end, which the rifle is setup for from the factory. For the bipod we selected the MLOK version of the Harris, the BR2 model which adjusts from 6-9" and has the built in leveler. For optics, we decided to keep it compact but with Power, and went with the Eotech Vudu 5-25x50mm First Focal Place Scope. This scope is shorter than most 25x Scopes, and will allow the shooter to clip on a thermal in front of the scope. The reticle we selected is the MD4, which is a stunner! This glass is insanely clear, and also illuminates and is easy for the shooter to operate. This is the perfect scope for what this rifle is designed to do! Included is a Gisele Hard case on wheels, that can stow the rifle and all gear. If you are interested in making the purchase, contact our shop and ask about our Mag Promo we are offering on this gun. Geissele does not include any mags with the gun from the factory.
 
Specification Features & More:
 
Model: MRGG MK1
Caliber / Gauge: .308 Winchester
Finish: Black 
Stock: Magpul PRS Lite
Barrel: 16" CHF Chrome Lined, Cold Hammer Forged. Delivers the accuracy of a Bolt Gun in a Semi Auto.
Receiver: Aluminum Billet
Twist: 1 in 8"
Weight: 9.7 Lbs.
Sights: None
Safety: Ambi Controls
Action: Semi Automatic
Gas Block: Strato, .812 Journal
Flash Hider: Huxwrk 7.62 Flash Hider, Nitride
Muzzle Thread: 5/8x24
Trigger: MRGG SSA-E 2 Stage Trigger
Capacity: No Magazine Included, Compatible with Magpul PMAG 20 LR/SR GEN M3.
Includes: Hard Case, on Wheels.
Made In USA
Build Level: Military Grade Gold Level
Build MSRP: $10,748.40
Our Price: $9649.00