Look at a prism scope. They're shorter and don't look as silly on a small gun.
They're completely usable w astigmatism. Come in red or green. The reticle is etched and always there like a reg scope but if you need you can illuminate though I rarely use the illumination.
They come 1,2,3 and 5X. I like the primary arms glx2x. The slx series is cheaper if money an option. I've got vortex also but primary arms is way better. They have dif mount options (and reticle options)dependent how far back you'd like it. I'll never put a reg scope on a turkey gun again and I'm surprised more guys haven't tried these