What's in the Box PTR 9SDM 9mm Semi-Auto Short-Barreled Rifle (2) 30-Round Magazines Cable Lock Owner's Manual The PTR 9SDM is a factory-configured, 9 19mm short-barreled rifle featuring a roller-delayed operating system, ported 4.58-inch barrel, PTR CS1 collapsible stock, and velocity reduction device. Engineered for reliability and handling, the 9SDM pairs PTR s roller-delayed blowback operating system with a purpose-built ported barrel, CS1 collapsible stock, and velocity reduction device.. The innovative 9SDM barrel features specially engineered ports positioned within the rifling grooves. These ports redirect gas to reduce supersonic ammunition to subsonic velocity while helping prevent bullet-jacket damage, minimize fouling, and simplify cleaning compared with traditional SD-style firearms. Firearm Specifications Manufacturer: PTR Industries Model: 9SDM Caliber: 9mm Action: Semi-automatic (Host ready for NFA-registered, auto sear pack) Carrier: Nitride heat treated, tungsten dead-blow weighted, full-auto bolt carrier Color: Black Overall Finish: Powder coated over Parkerizing Barrel: 4.58", twist 1 in 10" RH Optic Mount: 13.2" Steel Picatinny Rail Magazine: 30 Round Steel Trigger Pull: 9-10 lbs. Stock: PTR CS1 Stock Case: Heavy Duty Range Case with Contoured Foam Insert Included Accessories: Magpul MBUS Pro Steel Front and Rear Sight, 2 Magazines, Trigger Cable Lock Trigger Housing Indicator: 2 Position