I've got a Bushmaster 20in. A3 that I'd like to get a scope for and I was wondering if any of you had any experience with Warne quick detach scope rings? They claim "return to zero" but I'm skeptical. I love to shoot my AR with iron sights but I'd love to be able to slap a scope on her for certain situations. Are there any other brands of quick detach "return to zero" scope rings that I should look at or are the Warne's sufficient?