I have two things to complain about:
First - the magazine is a great solution for gbb players who just want to have fun and don't want to spend 60€ for 30 shot magazines.BUT:1. The HPA valve is an in and out valve. Since the mp5 magazine still has the original gas valve, one could have (if an only in valve had been installed) filled the magazine with gas during storage and thus avoided a lot of work and leaks.2. The magazine holder is 3d printed. I have had the experience with 3d printed parts that they unfortunately break after 1-2 shots. This would of course be a bad mistake with the magazine, because then the whole construction would fall apart.For me, the biggest shortcoming is that no only in valve was installed.Power6 if you read this. Please take my tip to heart. There is nothing worse in a gas magazine than a gas magazine which is leaking.