Metric pistons have an O-ring to help keep the silencer tight while firing. Each pack comes with two O-rings.
Caliber | 9mm |
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Nfa Thread Pattern | 13.5x1mm LH |
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Additional Feature 1 | O-ring for Metric Piston |
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Additional Feature 2 | Piston Thread 13.5x1RH&LH |
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Determined at checkout.