How ironic that I see this here. I recently placed an order for the RS7519 model that I plan on using with my 10.3 barrel to try and alleviate the dreaded "Gas Face". Wasn't aware this existed until I saw it on Hanson Brothers site and did my own homework. Damn fine looking product that seems to be more squared away than other AGB's. No more having to remember my allen key before a range trip.