Check the eye relief specs on shotgun vs rifle scopes. I believe the reason for the scopes being designated for a shotgun is longer eye relief. The reason is the mounting systems for some shotguns places the scope farther forward than traditional rifle mounts. Also most shotgun scopes are lower power for closer range work. I have a Weaver V3 1-3x scope on my BPS and it works great. The recoil of a shotgun is similar to a large magnum rifle so there's not much difference there. However airguns and crossbows have reverse recoil so there are scopes made especially for them. Hope this helps, Dave