present invention detached from picatinny rail 20 by way of background picatinny rail 20 is an elongated bracket that may be attached to a firearm to provide a standard mounting platform for accessories and attachments such as a scope light bayonet and the like rail 20 is typically comprised of a plurality of raised spaced apart lugs or ridges 22 along its top or upper surface with channels 24 located between and formed by said ridges 22 and a rail flange 26 extending along each side of rail 20 the side slide lock and quick release device 100 of the present invention is preferably comprised of a lower portion 110 an upper portion 120 removably attached to said lower portion 110 through the use of fasteners 130 and a locking mechanism 140 for detachably securing device 100 to rail 20 without the need for external tools as best illustrated in the figs lower portion 110 is an elongated member having a top surface 111 a bottom surface 112 opposing side surfaces 113 a rear 115 a front 116 a rear fence 117 and a forward fence 118 wherein said rear fence 117 and said forward fence 118 extend downwardly from said bottom surface 112 for mating engagement with rail 20 as described more fully below lower portion 110 further comprises.