Hence my original posit in the thread:

The Colt would be the easiest solution and pretty cost effective at ~$1000, as all I would need to do is throw a rail that I already have on there...
Ky Gun Co has them for a couple bucks more. AU seems to be hit and miss on shipping and tax, so AU is probably still the top contender. I still haven't made it down to my local gun store to see how impressed they are with their products.