That looks pretty good. I like how you used brass, it looks "shelly", instead of bolt_snipers PVC. I would try and put it on something like a... 3B or Max Shot. It also looks a little odd.
Sorry for my forgetting of this topic but... VACC said "Meh" on my topic!
But yeah, I hate poeple saying "Oh thats a cool guy in cool armor with a cool gun." without them knowing it's a Space Marine from WH40K. I abuse those poeple .