Rifle Scopes Night force turret is stuck

buckskin52

Sergeant
Full Member
Minuteman
Sep 13, 2009
437
3
43
western PA
I have a nxs 5.5x22 no hs or zs. The elevation turret will not adjust up or down. I tightened the set screw pretty tight but it just slips. I believe I am nearly bottomed out but I have never had this issue before and I have had this scope for a few years. It is on a Edm wind runner 50 bmg. Any suggestions?