http://www.eregulations.com/nevada/hunting/weapons-regulations
Then on that page...
Sight Attached to Firearm, Bow or Crossbow
A sight attached to a firearm, bow or crossbow may be illuminated or powered by:
A battery contained within the sight;
Light gathering fiber optics;
A radioactive isotope such as tritium; or
Iridescent or fluorescent paint.
The sight/scope may not cast or project a visible beam of light (Refer to NAC 503.145). The Department may issue a scope permit to a person with a visual disability. The scope permit authorizes a person with a visual disability to hunt, during a type of hunt that is restricted to bows or muzzle-loading firearms, using a 1 x magnification rifle scope that is mounted on a bow or muzzle-loading firearm.
(Refer to NAC 503.146)
And...
Muzzle-loading Rifle and Musket
(Refer to NACs 503.142 & 503.145)
During a ?Muzzle-loader-Only? Hunt:
Caliber
Firearm must have a single barrel of .45 caliber or larger.
Ignition
Wheel-lock, matchlock, or flintlock ignition system, or percussion ignition system that uses a primer or percussion cap; (in-lines are permitted.)
Legal Projectile
Lead ball, lead bullet, semi-jacketed bullet or a metal alloy bullet that expands. A saboted round may be used.
Sights
Only open sights or peep sights are permitted; scopes prohibited. A sight that is operated or powered by a battery, electronics or a radioactive isotope such as tritium is prohibited.
Powder
Only black powder or a black powder substitute may be used; smokeless powder is prohibited.
This should answer all the questions.