The Rigby action certainly looks like the MERKEL action which is an Anson & Deeley action. Butch Searcy says he has had them apart, and they are definately Merkel box locks! Contrary to the thinking of some, that isn't a bad thing. The Merkel actions are very strong, and there will be no problem with any rifle made on them, because of the action, as long as the cartridge is one common to double rifles! The action simply isn't a worry!