The Hera Arms H3T GEN 2 Magazine fits naturally in your hand with its tapered leading edge while a textured surface provides positive control. Centering support fins along the top of the mag square it off when inserted into the magwell, preventing it from rattling in place. The transparent window allows you to instantly identify a loaded magazine from the sides or rear while index marks in the window indicate 20 and 30-round capacities helping you to keep track of necessary reloads.