The frame is a ground-up Shadow Systems design, not a rebrand of another frame already on the market.  The tooling uses new technology to wrap more texture around the curves of the frame and put the grip in places not normally seen on production guns. Slides feature front and rear directional serrations.  These serrations provide excellent traction when manipulating the slide, but are relatively frictionless when drawing the pistol from a holster.  The DR920 features deeply recessed front serrations and corner chamfers.  This thinned front profile gives greater control and reduces the difficulty of inserting the pistol into a holster, particularly a partially collapsed IWB holster. Other Features: Compatible with Glock G17 holsters, magazines, & accessories Flat-faced aluminum trigger   DETAILS Color: FDE Caliber_Multi: 9mm Luger Firearm_Action: Semi-Automatic, Striker-Fired Magazine_Capacity: 10 Firearm_Barrel_Length: 4.5" Sights: Green Outline, Tritium Dot Front, Black Serrated Rear Slide: FDE 17-4 Stainless Steel Barrel Material: 416R Stainless Steel TS_Dimensions_Height: 5-1/4" Barrel Finish: Black Nitride Barrel Type: Spiral Fluted Trigger Pull: 4.5 to 5 lb