My .50 cal left hand percussion rifle came with a screwed up barrel, the nipple and the hammer wouldn't line up right, had to send it back in, they put a new barrel on it and sent it back to me, when i put the primative sight in it, it was loose so i ordered another sight, it slid right threw the dovetail, i shimed up the better fitting of the two sights with copper shims and sighted it in, then used green loctite to seal it together, seems to be working fine now, besides all the trouble it was, i really like the rifle, it shoots great, handles well and has the classic look of a plains rifle.