I can comment on the gas block. I'd give the Wilson a try. I've used the PRI blocks in the past (still currently have some). They work fine as long as you don't mind modifying some brand of forearms if the adjustment screw doesn't line up. Granted, a couple hits with a dremel, and you can usually get the spot open you need opened up. Or, a more precise hole done with a drill press. I've tried both. They work, but as I move forward, I'll be using different blocks.....such as the Wilson you mentioned, or the Syrac (I kinda like them too after reading up on them). That's the only drawback with the lo-pro style.....access through the rail. But, anything can be resolved with a little brainpower, tinkering and BEER. <thumbsup> Not necessarily in that order.