What Quick Release Scope Mounts

Got an Impact .25. Has a Hawke optical on it now. I also have an XTN sight I'll want to put on it on occasion for some rat disposal at a local farm. Two questions...what mounts should I put on the scopes to allow a quick change?? And I have read tons and most seem to say that the rifle maintains zero after a change. Is that really so in other's experiences? Thanks!!