Have you checked the hop-up (actually opened the gun and looked at the hop-up)? If not, I'd do that. Also, try to get ahold of the seller and tell them the problem. If you find anything wrong with the hop-up then they might replace it, seeing as you just got it and it's already not working correctly. A hop-up should come in good condition, especially in a DMR. What kind of battery are you using and what weight bbs?