I did my fitting and Turning trade, then joined the army as a Fitter/Armorer and got RPL and pushed through the trade course, but got the Armorers course pretty quick.
It's a good course, a crash course in weapon and ballistics history and theory, then get to work on military weapons... Pistols, rifles .22 and .308, shotguns, Rocket Launchers, Grenade launchers etc.
Only prob is it's all parts replacement, not repairs if you get what I mean. So you cannot go and drill a hole in the receiver here, or thread the barrel there lol.
Simply inspect and replace parts as required. Although repetitive, it's a good start and you could ask around for part time work at a gunsmith after hours or on weekends.
Also potential for further work with spec ops weapons, US military weapons, mounted weapons, mortars, guns (M777A1 - 155mm) etc.
You'll also work on general engineering stuff like marine equipment, welding, small engines, and a myriad of other gear.
Also fun to get on big boys toys like ride in a chinook or blackhawk, watch or participate in cavalry (bushmaster, tanks) doing battle runs, work alongside SAS, and the list goes on.
You could also specialize as an ammo tech later on if you were elegible. Good experience IMO. It does have it's downsides though lol. DYOR.
I am a civvy now though... couldn't be happier