The Tisas Night Stalker SF 9MM is now available in a double stack version! Built around Tisas' forged slide frame and barrel that are machined to exacting tolerances the new DS (Double Stack) models combine all the features of modern high capacity 1911 pistol with the reputation for quality and value we are known for. Tisas 1911 DS model's polymer grip modules have 25LPI checkering on the front and rear and molded texture w/ an Aluminum removable magazine well.DS Series pistols come standard with our premium lockable hard case two magazines cleaning kit bushing wrench trigger lock and instruction manual. LENGTH: 9.3" HEIGHT: 5.74" WIDTH: 1.62" WEIGHT: 35 OZ (UNLOADED) ACTION: SINGLE ACTION SAFETY: AMBI THUMB & GRIP SAFETYTisas 1911 DS Series Pistols are compatible with TisasA(R) DS Military Armament Corp.(TM) and other STI 2011(TM) Magazines.Optics Mounting Info: Direct Mount for Holosun 507k & RMSc Footprint Optics Factory Sights Lower 1/3 Cowitness with most optics Optic Mount Thread Pattern: M3 x 0.5 Torque Specs Minimum 10.2 in-lb Max 11.9 in-lb Blue Thread Lock or Equivalent w/ breakaway rating of 71 in-lb