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Metric pistons have an O-ring to help keep the silencer tight while firing. Don’t be caught without a backup. Package contains two O-rings.
Sandman Flash Hider Front Cap
1/2×28 Thread Protector / DA424
Booster O-Ring Pack / AC88
Rimfire O-Ring Pack / AC87
Hybrid Front Cap
Saker Flash Hider Front Cap
Thread Protector with O-Ring Engagement / AC6
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