Any 'smith that builds Bullseye guns can do a roll trigger . All my 1911 wadcutter & Hardball guns have them . It's easier to keep sights aligned with constant trigger movement . True Radius sear & longer hammer hooks . A good one you can feel the sear roll out from under the hooks , but it has to be smooth , not creepy . I'd stick with a short roll to start with as for most a long roll is hard to master . Bullseye is shot one-handed so trigger control & smoothness is paramount . Barrel fit / lockup is also important especially for 50yd accuracy . Some of the better BE 'smiths include Roddy Toyota , John Eullette , Alex Hamilton , Buddy Chapman , Travis Strahan , KC Crawford , David Sams , Greg Derr .