Unity Tactical WZL, Full Magazine Indicator, Compatible With All Gen 2 and Gen 3 Magpul Pmags for 556 and 300 Blackout, Matte Finish, Black MS-WZLB WZL is a magazine enhancement that enables rapid visual and tactile confirmation that the magazine is fully loaded and easy differentiation between magazines with mixed loadouts. When fully loaded with 30 rounds" a black" blue or orange indicator will emerge from the baseplate" allowing you to identify magazines with different rounds" such as ball" tracer" supersonic and subsonic. The three-color options provide the user with the ability to quickly and confidently identify three separate loadouts when utilized in conjunction with standard floor plate / lock plate combinations. The indicator features an indentation around its side for easy application of a paint pen for further distinction of round type. When reloading in the dark or grabbing gear quickly" WZL provides visual and tactile verification that your magazine is fully loaded and that you've grabbed the intended ammunition. WZL comes in a three-pack and is compatible with all GEN M2 and GEN M3 Magpul PMAGs for 5.56 and .300 blackout. It also works with a Ranger Plate and a MagPod. It is not compatible with magazine limiters or round limited magazines" such as 10/30s.