Here's my fix for the Trophy Hunter that I will be using in my own games.
Trophy Hunter (Ranger Archetype)
Armor and Weapon Proficiencies: Trophy Hunters are proficient with all simple and martial weapons, firearms and light armor.
Have Gun will Travel: At 1st level, the Trophy Hunter gains the Gunsmithing feat as a bonus feat. He also gains a battered musket identical to the one gained by the gunslinger. This replaces medium armor proficiency.
Improved Tracking: as the power on page 67 of Ultimate Combat.
Firearm Style: as the power on page 68 of Ultimate Combat.
Hunter’s Aim: as the power on page 68 of Ultimate Combat.