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SilencerCo AC31 Osprey/Octane Piston for 9/16x24 threaded silencers. Material is 17-4 stainless steel. Caliber is .40 S&W. Thread pattern is 9/16x24 tpi. Model: Osprey/Octane. Mfg Part Number: AC31. UPC: 817272010213. Condition: New. This piston is designed for SilencerCo Osprey and Octane suppressors.
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