Near future weapon concepts inspired by the movie Aliens and many other things.
the bottom left one looks like the M82A3 sniper rifle but with no barrel and half sized mag and the one on top of it has something from SCAR-L
Bull pup designs usually mean that the barrel is the same length but pushed into the back of the gun.
Could you write characteristics? For all concepts.
Good job. Look very sturdy and spaced well around parts of the weapons. Don't like the top right one though.