The Walther PDP PRO-SD F-Series pistol in 9mm Luger brings the Performance Duty Pistol line into a compact, duty-ready 4.0-inch barrel package that suits duty carry, home defense, and competitive shooting; the F-Series builds on Walthers PDP family with a refined PDT F-Series trigger offering roughly a 5 lb. pull and a short 0.24" travel for consistent follow-up shots, while the optic-ready, serrated steel slide and steel slide construction provide durability and fast target acquisition across a 6.4" sight radius. With a polymer frame engineered for a 5.5" medium backstrap grip circumference and a 2.56" trigger reach, shooters get a secure, ergonomic hold that tames recoil in an overall 7.25" length and a slim 1.34" width, and the 4" barrel balances concealability and ballistic performance. At about 21 oz. unloaded and 24 oz. with an empty magazine, the PDP PRO-SD is light enough for extended carry yet stable for accurate fire; its striker-fire action, three automatic safeties, and 18+1 capacity make it well-suited for service use, range days, and defensive roles, and note that FFL transfer is required for this firearm.