This is well executed with attention to detail. I think the trigger shape is wrong, but that is probably a perspective issue. Oddly, the wood table the rifle is laying on is better than the rifle's furniture, which is too glossy and too smooth. If you improved that texture and its associated bumpmaps etc it would look damn close to perfect.
Incredible work!!! looks real!!! But, (I hate to be that guy!) The extractor is off. Its out too far, It doesn't sit flush with the receiver it should be closer to the bolt. And the safety is WAY to small actually, the whole bolt sleeve is a bit to small. And as another guy said something about the bolt handle seems off too. If you fixed those details I would of never believed it wasn't a photo of a real rifle! (Sorry man, It's just that I own several Mausers and those things jumped out rite away at me...you know how us gun nuts are...lol)