This is my current CQB gun and I love it to bits. It is extremly compact and very usable for CQB, and you won't have your barrel peaking around corners giving away your positions as other guns might. If you are looking for a P90 I consider this the best option aside from the $600 G&G P90, or the King Arms P90 only available in asia, which has a nylon fiber body and quick change spring. If you are looking for a CQB weapon in general this is a great choice if you are prepared to buy mid-caps and get used to the awkward reloads. However, it is important to note that because of the way the trigger is attached to the gearbox, on semi auto if you pull from the bottom 1/4 of the trigger, it will not fire. Anything above that works fine and there are no problems on full auto.
Small size perfect for CQB
Plenty of Rails
Hi-Caps Don't Work
Hard to align lasers and sights because how high they are above the barrel
Semi-Auto doesnt work if you pull from the bottom of the trigger