If you just want to plink in your backyard then just get a BB gun that shoots steel BBs. And only use iron sights which will teach you instinctive aiming. I’d say that’s actually way more fun than a scoped air rifle. If you’re not going to be head shorting squirrels then you don’t really need the accuracy of a dialed in air rifle. Looking in a scope at a piece of paper and shooting the same hole looses its appeal pretty quickly.