This been my baby for a while i’ve been running it hpa but i have 3 mags for it aswell i believe one leaks. It is pretty short stroked to the point where the slide doesn’t lock back but it dose have a balancing point in the middle as shown in the picture above. The slide lock is loose on it, it falls out which is why it has a small pice of tape holding it in but the tapes never failed 😭. I have a hpa mp5 mag adapter as well as 2 mp5 mags. but that would be extra (light not included)