Welcome! I'd agree with everyone that your crate is your strongest piece. But the gun has potential, you just need to fix the texture, right now its reading as stone like marble or something and its all uniform. Put more wear on parts more exposed, maybe add some rust too.
According to this graph, I am somewhere between average joe and decent artist. I get positive replies stating my modeling skills have been beefed up from the ones I started with. I do get crits for minor tweeks. hmm.. Welcome to the Polycount OP, really nice work right there sir. :)