I've got one rifle in an XLR Carbon and one in an AICS and both are good solid units, although I like the XLR a little bit more (strictly personal feel, not by any deficiency of the AICS chassis) and as soon as some more fun money is freed up I'll be selling the AICS and getting a second XLR to replace it most likely that one will be an element so I don't have to swap out my Spuhr Mount on that scope since it's 35mm and doesn't have the greatest resale options without selling the scope with it. If you're interested in the AI let me know, it's well loved/used but comes with both the original skins and a set of Viper skins with Flush cup sling conversion already done on it as well as the spigot mount for the bipod.

The KRG's are solid chassis, but I can't stand the grip on them and it's not a quick swap out deal.