"I received this magazine with my A&K Mk43 and I loved it. The gun was shooting amazing, and the mag always kept me firing. I spent $200 getting various upgrades for the guns internals, one being a LiPo battery, but there is a small metal piece inside the motor of the box mag that is easily breakable with the added force. I repeat, NOT LiPO ready. And I don't see any parts or upgrades to fix this motor... I guess I get to shell out $50 more just to play with this thing. Sucks there isn't a reinforced steel one."