Differences between Slide-Lock® and Rail Grabber Interfaces.Slide-Lock® - Works with factory mount pistol rails and 1913 (Picatinny) rails. Can be slid on and off quickly without tools. Supplied with the standard backplate, with on/off & momentary switch.Rail-Grabber - Fits all 1913 type (Picatinny) rails & factory pistol accessory rails. Can be tightened to the rail for a more secure fit. Typically is used for long gun applications, but will also fit pistols.Models Available:Slide-Lock® Pistol-Glock:The most popular version. Slides on/off & locks on Glock pistols without tools. The dimensions of the Glock slide (accessory) rail are different than other pistols with accessory rails. This model will ONLY FIT GLOCKS.Slide-Lock® Pistol 1913 Rail: This model is for pistols with factory accessory rails or with adapters. This model also fits all standard rail sizes (i.e. Picatinny, 1913, etc.). Will slide on/off & lock without tools. Slide-Lock® Long Gun-1913 Rail: This model slides onto any standard rail (i.e. picatinny, 1913, etc.). It comes with the long gun backplate & remote. This backplate has a plug port for a remote and has a switch to activate as well. The switch has a on/off & momentary. Will not fit most pistols because the trigger guard is too close to the back plate.Rail Grabber-Pistol: This model will fit all factory accessory rails and all 1913 type rails. Includes standard backplate with on/off & momentary functions.Rail Grabber-Long Gun: This model includes the long gun back plate and remote. The backplate has a on/off & momentary switch as well as the plug port for plugging in a remote switch.