Geissele VSASS MRGG Mk1 .308 Win Rifle 16" Barrel - Black

Geissele VSASS MRGG Mk1 .308 Win Rifle 16" Barrel - Black

Born from the elite Very Long-Range Semi-Automatic Sniper System (VSASS) program and officially adopted by United States Special Operations Command (USSOCOM) as the Geissele MK1 MOD0 (MRGG-S), the Geissele VSASS® MRGG MK1 16″ .308 Rifle brings frontline sniper capability directly to marksmen who demand uncompromising precision. Built from the ground up to conquer the modern battlefield and competitive gas-gun divisions, the Mid-Range Gas Gun (MRGG) merges bolt-action mechanical accuracy with rapid semi-automatic cyclic speed. Engineered and hand-assembled by Geissele master craftsmen in North Wales, Pennsylvania, every component of the MRGG MK1 is harmonized to deliver relentless reliability, subdued recoil impulse, and flat, surgical tracking when every round counts.

The ballistic and cyclic heart of the rifle is Geissele’s patented Phased Array® gas delivery system paired with the Geissele Tri-Port® architecture. Built around a robust .812-journal Strato gas block and a custom rifle-length gas profile, this system meters and exhausts high-pressure propellant gases through multi-stage expansion ports. This drastically flattens the bolt-carrier pressure curve, reduces cyclic velocity, mitigates carbon blowback, and delivers an exceptionally soft recoil stroke. The operating system drives a 16.0-inch Match Grade Cold Hammer-Forged (CHF) chrome-lined barrel with a fast 1:8-inch twist rate, optimized to stabilize heavy 168-grain to 175-grain+ match and duty projectiles. The muzzle is threaded standard 5/8x24 TPI and arrives factory-equipped with a nitride-finished HUXWRX 7.62 Flash Hider, serving as an immediate quick-detach mounting platform for HUXWRX Flow-Through® suppressors.

The chassis is built around a CNC-machined aluminum billet receiver set featuring an integrated steel-reinforced cam race to permanently eliminate interior upper receiver gouging under high-volume firing schedules. Manipulation is entirely instinctive through full ambidextrous lower controls, highlighted by a proprietary dust-cover-actuated bolt catch, a rearward bolt release button, and an enhanced ambidextrous charging handle. Internally, the rifle runs Geissele’s proprietary MRGG Reliability Enhanced Bolt Carrier Group, treated in their exclusive Nanoweapon® coating for extreme surface hardness, slick lubricity, and effortless carbon cleanup, paired with a forged Carpenter 158+ high-pressure bolt. Precision fire control is anchored by the combat-proven MRGG SSA-E two-stage match trigger, while recoil energy is absorbed by the Super 42® braided wire spring and H2 buffer assembly. Outfitted with a 13.5-inch MRGG MK16 M-LOK handguard, an ergonomic Geissele A22 grip, and a Magpul PRS Lite adjustable stock, the 9.7-pound MRGG MK1 sets the definitive standard for .308 tactical platforms.

Features

USSOCOM MRGG-S / MK1 MOD0 Provenance:
Directly derived from the U.S. SOCOM Mid-Range Gas Gun - Sniper (MRGG-S) program, delivering military-contract precision engineering, parts longevity, and sub-MOA reliability.

Patented Phased Array® with Tri-Port® Gas Architecture:
Meters and vents propellant gases via phased expansion geometry and a .812″ Strato gas block, reducing felt recoil, delaying bolt unlock, and cutting toxic port blowback for flat-shooting follow-up shots.

In-House Cold Hammer-Forged (CHF) Match Barrel (16″):
Hydraulically forged around a precision mandrel in North Wales, PA, featuring an industrial hard chrome lining, 1:8″ twist rate, and rifle-length gas system to deliver bolt-gun accuracy with gas-gun speed.

Steel-Reinforced Billet Receiver Set with Full Ambi Controls:
Precision-machined billet aluminum construction featuring a steel-reinforced cam pin track to eliminate receiver wear, complemented by an ambidextrous layout with a dust-cover-actuated bolt catch and rearward release.

Nanoweapon®-Coated Reliability Enhanced BCG:
Features Geissele’s proprietary Nanoweapon coating for supreme wear and corrosion resistance, housing an ultra-durable forged Carpenter 158+ high-pressure bolt.

Geissele MRGG SSA-E Two-Stage Match Trigger:
Equipped with a finely tuned two-stage trigger featuring a light, smooth first stage and a crisp, candy-cane-like second-stage break for surgical long-range shot placement.

HUXWRX 7.62 Flash Hider Suppressor Mount:
Factory-mounted 5/8x24 muzzle device finished in salt bath nitride, quenching muzzle flash while providing a rock-solid QD interface for HUXWRX Flow-Through suppressors.

Super 42® Braided Wire Recoil System & Magpul PRS Lite Stock:
Combines Geissele's braided wire spring and H2 buffer to dampen cyclic vibration, anchored by an adjustable Magpul PRS Lite precision stock for optimized comb and LOP setup.

13.5″ Free-Floating MRGG MK16 M-LOK Handguard:
Offers full-length rigid top Picatinny rail real estate with 7-sided M-LOK mounting slots for clip-on thermal/night-vision optics, laser designators, and bipod systems.

Specifications