Thanks for confirming the AA2700 thing John, I'd heard that but wasn't certain.

My 17 is an early BDL and I'll say that in it's case fouling is pretty much a non issue. I cleaned it down to bare metal when I bought it, and decided to give it a fair shake before rebarreling. It shoots lights out and I've let it go 200 shots between scrubbings with no major change in group size.