(1) 166.250 (unlawful possession of firearms) doesn't affect:

(a) a parole and probation officer, police officer or reserve officer

(b) a federal officer, a certified reserve officer or corrections officer while acting within the scope of employment.

(c) an honorably retired law enforcement officer, unless they have been convicted of an offense that would make them ineligible to obtain a concealed handgun license under 166.291 (issuance of concealed handgun license) and 166.292 (procedure for issuing)

(d) any person summoned by an officer described in (a) or (b) above to assist in making arrests or preserving the peace, while the summoned person is engaged in assisting the officer

(e) the possession or transportation by any merchant of unloaded firearms as merchandise

(f) active or reserve members of:

(A) the Army, Navy, Air Force, Coast Guard or Marine Corps of the United States, or of the National Guard, when on duty

(B) the commissioned corps of the National Oceanic and Atmospheric Administration OR

(C) the Public Health Service of the United States Department of Health and Human Services, when detailed by proper authority for duty with the Army or Navy of the United States

(g) organizations which are by law authorized to purchase or receive weapons described in 166.250 (unlawful possession of firearms) from the United States, or from this state

(h) duly authorized military or civil organizations while parading, or the members thereof when going to and from the places of meeting of their organization.

(i) a person who is licensed under 166.291 (issuance of concealed handgun license) and 166.292 (procedure for issuing) to carry a concealed handgun

(2) it's an affirmative defense to a charge of violating 166.250 (unlawful possession of firearms) (1)(c)(C) that the person has been granted relief from the disability 166.274 (relief from prohibition against possessing or receiving firearm)

(3) except for persons who are otherwise prohibited from possessing a firearm under 166.250 (unlawful possession of firearms) (1)(c) or 166.270 (possession of weapons by certain felons), 166.250 (unlawful possession of firearms) doesn't apply to or affect:

(a) members of any club or organization, for the purpose of practicing shooting at targets upon the established target ranges, whether public or private, while such members are using any of the firearms referred to in 166.250 (unlawful possession of firearms) upon such target ranges, or while going to and from such ranges

(b) licensed hunters or fishermen while engaged in hunting or fishing, or while going to or returning from a hunting or fishing expedition

(4) The exceptions listed in (1)(d) to (i) constitute affirmative defenses to a charge of violating 166.250 (unlawful possession of firearms)