I need some collective wisdom. I have a CVA Optima V2. Sighted it in 2 yr ago with a Nikon Prostaff 3x9 BDC and it shot really well. Didn't touch it last year due to injury. Took out today and it shot2" low @ 100 yds. Tried elevating 2 " and it shot the same. Raised it 2 more inches and stayed low, no upward movement at all. What gives? How an anything happen to it when all it has done is sit in gun safe for 2 years?