If you plan to hunt Idaho or Washington your muzzle loader can't use 209 primers and the ignition must be exposed. I know TC makes a gun that meets these requirements. I don't know of any other states that won't let you use a 209 primer. In Utah you can use a scope with no magnification such as a red dot. All other states I know of are iron sights only. I have a Knight disc extreme. It's been very reliable and even fired after being under water for 40 minutes!