I like this gun, first airsoft sniper rifle, quality feels great. It came with a 4x30 scope, 2 mags, carry strap, and 1000 of the .25g TSD BBs. I can't seem to get it dialed in though and do not know what the issue is. I have disassembled it, cleaned off the exiting grease and regreased in a few areas. Soaked the hop up bucking in some warm soapy water for a little bit then washed it back off real good. It still shoots some pretty bad groupings. maybe 5 out of 10 shots will hit a 1 foot by 1 foot target from between 50-75 feet away. Playing around with the hop-up doesn't help much either. the Other 5 shots that don't hit the target usually fly way off to the right or to the left, and sometimes they shoot way low of the target. What are some issues I should look for that may be causing this problem. They will usually shoot out fairly straight for 25-30 feet, then start to arc off target. Should I get some heavier BBs?