Have had el cheapo BSA red dots on several turkey shotguns. Have lasted 9-10 years and still going strong. Not bad for a $19.95 piece of Chinese junk. They are a 3 MOA dot, I think. Good to great for turkeys. Probably not the best for precision shooting with a single projectile.
Just snagged a new Weaver red dot for on top of a turkey gun this spring. It looks like it will be a DARNED NICE sight. Have yet to mount it. It DOES have a secret hiding place for an extra battery right on the sight. SOMEBODY was thinking !!!