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.
 
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