Awesome! Will be patiently waiting for updates. I spent yesterday taking measurements and swapping barrels to double check my claim in the OP that Mav 88's, 500's and 590/A1's would be able to accept a kit (if you guys go that route) and was confirmed, good sanity check if nothing else.
Anyway *ahem* if you guys need someone to test these out, I'm not recoil shy and I pretty much live just down the road