There are three Choate forends, available from H&R/NEF/Marlin, direct from Choate, or from resellers: the varmint, with the adjustable-position stud for a bipod; the standard synthetic forend; and the Store-Arm, which has two cavities for storing stuff. You should specify which one you are inquiring about. Sorry, but I'll be no help after that with your original question.