yes they do use adjustable sights....they have a modern hunter contest thats the one i shoot in , I don't have the outfit of the 1800s and i have fiber-optics on my new englander....the guys that dress up have both fixed sights and adjustable ones (no fiber-optics) I hit 11 targets out of 16 or 18 sunday with no miss fires I did have trouble getting powder out of my powder horn at first sunday lol I've shot my renagade 56 smooth bore, a 50 rifled renagade,54 hawkens, new englander 54 ......i ended up winning the modern hunter div sun with 11 hits....there was a new guy shooting sunday and everyone let him shoot there guns he was happy he got to shoot some really nice custon guns 62 cal and 58 cal flintlocks.