WR TACTICAL 2 ROUND HOLDER - SPARE TWO ROUNDS HOLDER Made by many vendors, but the WR difference is that 1 size fits all. 1 unit will fit all the usually cartridges - 223 Rem & 308 Win type sizes. Will take 300 Win Mag sizes, with little distortion... Simply mount to the rifle using the self adhesive velcro patch, preferably below the ejection port for quick loading from holder to receiver. Easily removable to use on different rifles. Weight: 40g/1.3oz.