Some issues to consider:
As mentioned earlier, eye relief matters.
Not all scopes are equal, and some scopes (especially the cheaper ones) were made to sell, not to be used.
Others seem intended for use with light recoil situations (like maybe for airguns?).
As you move to cartridges with more recoil (and as you get older) the eye relief must be carefully considered.
Stock design matters.
Standard length of pull on factory stocks seem intended for a teenager, or ????, all I know is they don't fit me.
AR stocks, especially collapsibles seem to need about 1" to 1-1/2" more length when fully extended.
If you had a good "cheekweld" on the stock, and held the rifle securely, why did your rifle move enough to bust you above the eye?
If it's not secure then it will move (something about the laws of physics).
If the scope was mounted for someone else, unless you have the same physical build, etc., it probably won't be right for you.
But, if you don't want to go to the trouble of changing/adjusting then just wear one of those rubber masks, like ice hockey goaltenders wear.
As mentioned earlier, eye relief matters.
Not all scopes are equal, and some scopes (especially the cheaper ones) were made to sell, not to be used.
Others seem intended for use with light recoil situations (like maybe for airguns?).
As you move to cartridges with more recoil (and as you get older) the eye relief must be carefully considered.
Stock design matters.
Standard length of pull on factory stocks seem intended for a teenager, or ????, all I know is they don't fit me.
AR stocks, especially collapsibles seem to need about 1" to 1-1/2" more length when fully extended.
If you had a good "cheekweld" on the stock, and held the rifle securely, why did your rifle move enough to bust you above the eye?
If it's not secure then it will move (something about the laws of physics).
If the scope was mounted for someone else, unless you have the same physical build, etc., it probably won't be right for you.
But, if you don't want to go to the trouble of changing/adjusting then just wear one of those rubber masks, like ice hockey goaltenders wear.