Starting on the bottom. Recoil stock is garbage and horrible placing of the magazine. The iron sights are also horribly calibrated and would be horrible to aim with. There is also no place for your hand on the front.

The second bottom one is maybe okay beside the handle looking like it would break off due to a combo of weight, recoil and constant forces transfered to the gun when moving. Also everything is written like some weeaboo had a frenzy after being called a weeaboo. The magazine also is very small and the caliber of bullet inside it would be better suited for a rifle.

The other one in that second image, is pretty well the same thing. And don’t even get me started on the triggers.

Middle one, how the hell do you hold it? Theres no grip, let alone a trigger. And how do you load the bloody thing? The oddly placed bayonet as well is almost useless due to it’s placing.

Second top image on the bottom. The thumbhole doesn’t allow the user to get a good grip of the gun. The recoil stock though is way too close the grip. The forgrip is questionable as well. The one up from it is good besides the leveling between the forgrip and stock. The 2nd one op from that is questionable for it’s recoil stock shape and the placing of the magazine in the front of the gun. Though it’s wieldable. The very tope one in that image is same problem as the bottom one but it’s even more bad. The magazine is the bullets can’t in anyway get to the chamber of the gun and be fired out the barrel due to it being seperated from the grip, same with the bottom one. The forgrip also doesn’t look comftorable at all with the spikes and hole.
The top one is practical just with problems of the boxy grip and design. And the leveling between the forgrip and stock. But it’s good.