a firearm sight and mount for use on the muzzle end portion of a firearm barrel . the firearm sight is an optical sight with an artificially illuminated reticle and it and the associated mount are adapted to be rapidly attached to and removed from the muzzle end portion of a firearm barrel without requiring any modification to the firearm barrel . the sight mount has provisions for not marring the finish of the firearm barrel . both the sight and the mount are made from light weight materials including plastic lenses in the sight and their weights are strictly controlled . the sight and mount increase the ability of the shooter to accurately and rapidly sight the firearm at both moving and stationary targets . a wide variety of reticles can be used such as those that are externally illuminated and self illuminating .