For Contenders the hanger bar is an "add on" ...it bolts right to the existing dovetail nuts in factory barrels or custom jobs. Just measure the spacing and let whoever you are buying the hanger bar/foreend from know that spacing. Georgia Jim makes nice foreends...hanger bar or no....Bullberry woodsmith makes nice ones as well...again hanger bar or no. I made a few of my own w/hanger bar.