Theft of a firearm is a specified offense under the general Utah theft statute. Under that statute, the severity of the charge is largely a function of the value of the item. Below a $500 value, the charge would be filed as a class B Misdemeanor, $500 to $1500 as a class A Misdemeanor. Most common firearms would fall into one of these two misdemeanor values and would be charged as a misdemeanor; however, any firearm, regardless of value, will be charged as a 2nd Degree Felony. That means that even if the firearm is of modest value, its theft exposes the defendant to all of the potential collateral consequences associated with a felony conviction—up to fifteen years in prison, firearm restrictions, ability to vote, etc. Read more about illegal possession of firearms.
76-6-412. Theft — Classification of offenses — Action for treble damages. [EXCERPT]
(1) Theft of property and services as provided in this chapter is punishable:
(a) as a second degree felony if the:
(i) value of the property or services is or exceeds $5,000;
(ii) property stolen is a firearm or an operable motor vehicle;…
(Source for full statute: http://le.utah.gov/code/TITLE76/htm/76_06_041200.htm)