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1/2x28 ---Specifications and Features: Walther PPQ M1 Semi Automatic Pistol 9mm Luger 4" Barrel 15 Rounds Polymer Frame Steel Slide Black Finish 7.1" Overall Length Stiker Fired Trigger 1.3" Width 5.3" Height 21.5 oz 3 Safeties Picatinny Rail

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1/2x28