I think this either goes into Modification Discussion or something?
To the models:
The weapons look quite okay due to the fact that you just started some weeks ago. But don't make the body of the weapons too fat. They don't have to fit exactly into the blockheads hand.
Make the whole rifles body and magazine thinner. Maybe make the scope a bit bigger? Maybe less vertices for the trigger guard, and maybe bevel the body (maybe not everything of it?) of the rifle.
Same for the pistol, make it thinner. The trigger looks a bit edgy. But otherwise I think it's kinda okay how it is.
Btw, you have a model of the hands? If not, I can give you one.