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Kevin, thread pitch is 1/2x28 TPI Sir. No adapter needed for 1/2x28 Suppressor/
Kevin - Per teh Walther Web site: This pistol comes from the factory with "8X.075 Metric threads" - you will need an adapter (which can be found at the following link) to adapt the barrel to 1/2"X28 threads. Adapter comes with a thread protector. www.opticsplanet.com/walther-threaded-p22-barrel-adapter.html Buds normally carries the adapters, but is out of stock. This pistol is not 1/2X28 threaded from the factory.
it is a "8X.075 Metric threads" but it comes with a 1/2x28 adapter included see *****UPC: 723364206993 Description: WAI PPQM2T 22LR PST 12R 4.6 TB Brand: Walther Arms Inc Model: PPQ M2 .22 Tactical Type: Pistol: Semi-Auto Caliber: 22LR Finish: Black Action: Double Action Only Stock: Black Polymer Frame Sight: FT: Polymer RR: Click Adjustable Barrel Length: 4.6 Threaded Barrel Weight: 19.1 oz Capacity: 12+1 # of Mags: 1 Safety: Firing Pin Safety, Trigger Safety Receiver: Black Polymer, Picatinny Rail Features: Loaded Chamber Indicator, Reversible Button Mag Rel; Anodized Aluminum Slide,********** Thread Adapter to 1/2X28