this is overall a great gun for a small sub machine gun.
i had problems with different electrical things that i believe was just specific to my gun. but i think some of it was due to the compactness of the whole thing. it is a sturdy design and , when its working , is a great gun.
one thing i'm disappointed with is you can't get a RIS system for it only the top rail.
i also can't find a stock that will fit on the end.
the only thing that will be a problem for sure on all the guns is when you eject the battery the bolt of the gun is what pushes it out and it cuts into the wires of the battery.
and after a few months the battery may die alltogether.
that happened today.
overall a good gun.