I know all about the RMC liners. I've been using them for years in my other flinters. As soon as I saw the liner in this I was going to change it when I got home. But it must have went with the other .50 cal GPH I had.
I've taken several deer with a .50 flinter and one with a .45 flinter but none with a .54 yet. I hope that changes come this season. As for bear - I have a .54 GM 1:70 caplock for those guys. Along with a .54 Lyman Plains pistol as back up.
I may just get the #57 sight. But I wonder how it will work with the LH lock now that I think about it?