I did a favor for my gunsmith friend and sighted in a rifle for his customer or should I say attempted to sight it in . He had a BSA scope and all I can remember is it had side focus and a large objective. It was mounted on a Mark X mauser in 30-06. It was new out of the box and mounted in its rings correctly. Bottom line first shot which hit 18" to the rightand the scope went south no amount of turning the W/E adjustments would make any difference. The eyepiece was wobbly as well, not sure if that is a before or after the shot situation. The guy just shook his head. I told him to bring it back to where he purchased it and buy a Nikon Prostaff or a Weaver.