Running CO2 in your gas blowback pistol puts massive stress on internal seals, often leading to rapid freezing and pressure leaks during heavy use. The Umarex and GHK Glock CO2 Piston O-Ring is built specifically to survive that abuse in your GHK Glock 17 Gen 3 or Gen 5. Manufactured from a specialized, low-temperature-resistant nitrile rubber, this replacement seal refuses to shrink or crack under the extreme cold and violent expansion of high-pressure carbon dioxide. By dropping in this factory-spec replacement, you ensure your training sidearm maintains a perfect air seal, giving you consistent muzzle velocities, reliable cycling, and a crisp slide lock on empty even during rapid fire strings.
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