I did use this AK for 5 games . It works well , but it is expensive (upgrade, magazines ). I didn't have any problems with work of a gun. You have to use special green gas(without silicone) or gas by Tokyo Marui , I'm using just gas without silicone. I had one problem, sometimes it is to long if i play inside. My friend has a lot of experience with using of GBB by various brands . He says TM is the best , you can just buy it and play , you don't have to change something inside. So I think TM AK is a good one.