I'd say speed up the end of the reload so it isn't returning to idle so slowly.

The magin could use a bit of work IMO. The gun shakes but the magazine doesn't 'cause' it to do so. The magin seems pretty straight forward so a little recoil back would look better I think. (or just take out the wiggle)

The boltpull, I think the hand shouldn't go as far back as it does. The slap looks pretty awesome.

looking good.