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Hi Thomas and welcome. SD = Walther's Suppressor ready Models (Threaded Barrel). Cheers and stay safe!

Thomas, SD stands for Shalldämpfer (the German word for silencer), models that share all the features and innovations that the firearms community loved and embraced about the original Walther PDP models but with a series of premium factory direct upgrades. So what are the new features? Threaded barrel Dynamic Performance Trigger Flared aluminum magwell Aluminum base pads on the three included 15-round magazines. *Note: The magwell requires the use of the aluminum base pads. Magazines with the standard polymer base pads will not seat in the magwell. Recoil lugs in the optic-cut slide . Stay safe & have a great day!

sd= Suppressor ready