I have an XP-100 with a center grip trigger & .223 barrel. I believe the barrel is aftermarket as there are no markings on it. It does not have a recessed crown but is simply faced flat. I would like to remove the barrel and chuck it up in my lathe to do an 11 degree crown. I also want to chamfer the inside of the chamber as the shells hang up on the lip of the brass when chambering. The problem I have is I don't know how to remove the trigger and want to know if the recoil lug has a pin as it looks like it has to be reassembled in the exact same place as the trigger appears to attach to it.