I was wondering if this kind of picatinny mount with quick detachable base for $7.50 shipped on Ebay is any good. (?) I already have it on an AR15. Yea, I own DD, Colt, Troy, LMT, LaRue and other top name hardware when it counts, but didn't know if simple stuff like this works well enough. (?) I already have this mount and 2 swivels on my 9lb AR15 and have pulled on the 2 swivels and base as a test. It seems a bit wiggly but doesn't pull loose. (but I'm not sure how much slack I'm supposed to feel) Is that a good enough test? Anybody have first hand experience with QD swivels failing. Yea, I'm suspicious about $7 stuff too but just as soon not pay $50-$75 for the 2 pieces if it's not necessary.