Copied directly from my listing on zeroin, if you have any questions you can PM me either here or there, I can supply more pictures or video on request.

"Bought this on the 9th of July, used in one game then decided I didn't really get along with it because my mags don't work well in it. Works great with the mag it comes with and other mags, but mine don't play nice and Im not swapping out my whole set of mags for one gun, other than that, works fantastic and for all intents and purposes is a brand new gun. Save yourself £60 off the retail price and enjoy this good shooter.
For reference I'm using dytac invader mags and while they fit, they don't feed great. Tested out standard metal m4 mags in the shop I bought this from and then Pmags from a buddy, both feed perfectly fine."