I'm only echoing the previous poster on both counts. I don't have any experience with the KAC safety so I can't say either way with regard to it. I do have an ambi safety from BAD and it's top notch. Installation is straight forward and pretty simple. If you opt for the short throw model from BAD (the BAD ASS ST) then you'll have to grind/file the little nub off for it to fit in your existing lower, but that's easy to do as well.
Steve
Disclaimer: I am employed by Shadow Systems. My posts on this site are my own and do not necessarily reflect the views of my employer.
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