These mags work fine in a CYMA M14, if you take care of them. NOTE: you must lubricate them and break them in before use!!! I shot some silicon into mine, then loaded and unloaded a couple times, and they now work great, where at first they only loaded like 10 bbs and misfed a lot. Overall, I like them, but they're nothing special.
-100 rounds easily (hold an entire speed loader each)
-work perfectly with care
-Out of the box, performance sucks.
-need to be lubed
-need to be broken in
-really nothing special
Rating: [4 of 5 Stars!]