Nice! Burst rifle looks great, but some of those gouges in the metal look pretty implausible -- what could have softly sliced into it like that? Even wood is too hard to make chunky, soft cuts into that deep.
Bolt pistol looks rad too, but the barrel needs thickened up! The actual inside of the tube should be exactly the same size as the cartridges for the gun to function.
Odium, that environment looks great, but the post process color as you've been using it really isn't doing it a lot of favors. I would tone it wayyyy down, or jump right into cool colors and tinge it sky blue. But that's a matter of taste! To me, clean, clear, vivid outdoor lighting with grunge and slime everywhere is a very realistic, very believable environment -- like you walked outside on a sunny day after everything had gone to hell.