first of all, my favorite of the lot, the ASMG (Assault Sub Machine Gun). this project started out from me wanting to make a magazine that would have similar qualities as the SSM (which you can find here), but for grey (1-slot) connector ammo. there is a small 7 round magazine and a bigger 13 round magazine, both with an internal, rubber band powered pusher and a bullet stop (ceiling), and both easily top loaded. the magazines are very unique and work flawlessly (you might see them soon in a little collab me and oblivitus are working on), but the gun isn't the best. it was very comfortable, had a high rate of fire, and was light-weight, but it was quite weak, had very bad accuracy, and you had to cock the ram in order to insert/ take out the magazines.
next, we have the simple rail pistol. i wanted to make a rail gun, small as possible, that would have a comfortable trigger and would use my SSM (refer to previous paragraph). at the end, it was pretty bad. the trigger was ok, but the ram had a lot of problems. also, to insert and take out the magazine, you would have to cock the ram. to cock the ram, you would have to pull the trigger, take the ram back and release the trigger. it was quite strong and quite accurate though.
the next thing isn't exactly a gun... it's a concept drum mag that uses a rotating pin to feed the bullets, and uses red gears to sort them. it uses blue rods, and it can hold about 28 rods. it occasionally jams and i don't know why. i've tried everything i can to prevent this, but nothing works. i was starting to build a gun for it, like really just started, but i stopped very quickly seeing as it wasn't working very well and i needed the pieces from it. this is based on vortus' smaller prototype version (click) which works much better, but i'm not sure how to connect it to a gun, and it holds only 13 bullets. if you want, go ahead and build it and try to solve the problems i've been having with it.
this next gun is a concept gun. it's a slingshot that uses a rope wound around a wheel on a ratchet mechanism with a crank to pull back and cock the rubber band. this allows to have a closed barreled slingshot (i'm pretty sure the first of it's kind), and allows to have a (removable) magazine and a bolt/pump to load the bullets. in the process of building, i found out that the rubber band turns and closes, not allowing it to catch a bullet, and therefore, i stopped building in the middle and so, some of the mechanisms aren't fully functional yet. this is an original concept and i encourage anyone to try and achieve what i couldn't, giving me credit for the concept.