||I bought 4 of these mags, ill give you the rundown from my perspective.
Bought for and one came and died after use.
100 less than regular high caps
my gun empties them in about half a minute
Fine mags, super fast wind. Wish all four had worked. Decent capacity.
TL:DR Buy these mags if you want some high caps with super fast winding.
If one keeps winding without releasing the tension, its dead.
Rating: [5 of 5 Stars!]