So I got a Scar mk16 on CL for 150. It's a co2 blowback. I shot a few rounds through it no problem at my house but went outside to play a match and it was 10 degrees. First thing that happened was I would shoot, it would cycle but no bbs would come out. If I tipped the gun they would fall out. Now it won't cycle all the way forward as if something is stopping it about an inch from the front. I took the spring guide out and the bolt slides just fine. Any ideas?!