I have owned 3 of these, and out of those 3, 2 have broken. Internally, when you wind the magazine there is a metal ribbon that creates tension and thus forces the BBs up the feeding tube. The end of this metal ribbon can break and cause the magazine to not feed at all. While it is fairly simple to fix this (simply gut the magazine and reseat the end of the ribbon, bending the end so it catches) you shouldn't have to. It also is not the best feeding magazine ever made, but no HiCap is. I highly suggest S-Arms 150 round MidCaps or any 100 round MidCap over this $28 HiCap.
-If it lasts, it will last a long time.
-Simple to fix if it breaks.
-Spring mechanism is simply not built to last.
-Internal ribbon can break causing the magazine to not feed at all.
-Is easily over-wound.
Rating: [2 of 5 Stars!]