The reflection is off. It looks like it's floating...

It's one good idea.

Besides what mossy said, i don't get why the bevel on PXL seems blurry, i think there's a setting there ( in layer styles) to make it look more solid, if you can't manage to find it, you might wanna solve that manually.
I see some edges are bumpy (meaning not straight) and I don't know if you did it on purpose to make it look older, or they are just masking problems. Don't give up!

thanks for suggestions

The Rules & Guidelines state: Rule 5.4 No External Source used in your Entry: In this case, your entry must have a step by step provided showing how the entry was made.
Author you better post one or the entry will be pulled. Also you could work on the edges of the gun a bit more as they are rather choppy and the shadow could be improved. All this is quite visible in High Res.