Brent,
I met Bob Roller one time at Friendship, IN back in the 80's but I really don't recall seeing one of his locks. I am certain I never saw one of his flint locks.
He was the only German speaker who spoke German with more of a southern accent than I have. Nice man and enjoyable to speak with.
I have both percussion and flint Roller locks. They are quite nice.
I vaguely recall discussion of someone that was building double barreled muzzleloading shotguns from salvaged cartridge guns. Does that ring a bell with anyone? I do not recall if they quality was good, bad, or otherwise.