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Mfg Item #: AC90
Metric pistons have an O-ring to help keep the silencer tight while firing. Each pack comes with two O-rings.
| Caliber | 9mm |
|---|---|
| Nfa Thread Pattern | 13.5x1mm LH |
| Additional Feature 1 | O-ring for Metric Piston |
| Additional Feature 2 | Piston Thread 13.5x1RH&LH |