50 round capacity; Next-generation impact and crush-resistant polymer construction; Long-lasting, corrosion-reisistant, stainless-steel internals; Seats fully loaded on a closed bolt; At approximately 1.5 lbs. empty, and 4.5 lbs. loaded, the Magpul D-50 is one of the lightest 50-round 7.62x51/.308 drums available; Anti-glare window on the rear provides quick rounds remaining indication