Barska scope 4-16x50 ao varmint i - Barska 4-16x50 AO Varmint Rifle Scope w/ Adjustable Objective - AC10042 Rifle Scope

Bought the same scope 4 years ago and used it on my.223 Savage model 11 and it worked great but the new one I bought won’t focus properly and the reticle isn’t sharp no matter how I adjust it.Mounted it on my new Ruger Precision rifle in 17 HMR and can’t get it to group shots with any ammo I use.