Thanks. I sent him a message today asking him that and I'll post up his response when I get it back. I'm personally thinking he's not going to want to touch the FSP if he doesn't need to. Hopefully his clarification will help as he joked earlier that it seems everyone has a different recommendation from each other.
I also need to double check on the gas system as his may be a carbine. I may have linked the wrong one from an old email. It's the same otherwise.... besides the gas system potentially.

