Ultra-light proprietary magnesium alloy from Mag Tactical has their AR15 lower receiver being 35% lighter than standard lowers on the market today. Not just looking to be the lightest on the market Mag Tactical Systems reinforced key areas of the receiver including the front pivot pin location and the trigger and hammer pin area. Longer trigger pin set included. Premium Grade, Ulta Light Weight Lower. Short Video: Why are these so cheap and where did they come from Please note that you have have to be AT LEAST 21 in order to receive transfer of this firearm.