BCA AEG Piston Head X-Ring

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Unlike traditional O-rings, X-rings seal better under pressure instead of blowing out. These X-rings are sized to provide a tight seal in standard cylinder sizes. We recommend sizi ng your cylinder to reduce internal friction as well. X-rings are compatible with piston heads with a single internal fillet, such as Ace1Arms Aluminum, Prometheus POM, and Lonex POM piston heads. Due to the small radiuses on X rings, we do not recommend using them in ported cylinders. Product comes with one (1) x-ring. Show more