Most of us would agree that firearms are what makes America different from the other countries. Was thinking how many songs from all eras referenced guns. Let’s compile a list.
Shotgun- Jr Walker and the Allstars
A Country Boy can survive- Hank Jr
Janie’s Got a Gun- Aerosmith
Born to be Wild- Steppenwolf
Fire Your Guns- AC/DC
The Ghetto- Too Short
Welcome to the Ghetto- Spice 1
Highwayman- Highwaymen
Pancho and Lefty- Haggard & Nelson
Born and Raised in Black and White- Highwaymen
Seven Spanish Angles - Willie Nelson & Ray Charles
I am sure I will add more later.
Almost anything by Marty Robins:
El Paso City
Big Iron
Running Gin
Mr. Shorty
To name a few.
Saturday night Special - Lynyrd Skynrd
I shot the sheriff - Eric Clapton
Cattlemans Gun - Dean Brody
Bang Bang - Cher
One correction in @Kerry12’s list - AC/DC is from Australia 
I can agree that majority of “gun songs” are written by American artists.
Few more American:
“Saturday Night Special” - Lynyrd Skynyrd
" Machine Gun"- Jimi Hendrix
“Don’t Take Your Guns To Town” - Johnny Cash
“Big Man With a Big Gun” - Nine Inch Nails
European groups / singers also have some good stuff:
" Tommy Gun" - The Clash
" I Shot the Sheriff" - Eric Clapton
“Billy’s Got a Gun”- Def Leppard
“Kids With Guns” - Gorillaz
Australia:
" Big Gun"- AC/DC
“Guns in the Sky”- INXS
Watch “Don’t Touch My Gun” on YouTube
YouTube Music
Shotgun Blues- The Blues Brothers
Sorry, didn’t intend to label the groups as American origin. Meant American culture.
Ragged Old Flag- Johnny Cash
Children’s Story- Slick Rick
Roll Mississippi - Charlie Daniels Band
Billy The Kid - Charlie Daniels Band
Red Headed Stranger - Willie Nelson
Mississippi Kid - Lynyrd Skynyrd
Bounty Hunter - Molly Hatchet
Mr. Siegal - Tom Waits
Ragged Old Truck - Johnny Paycheck
ETA
Ruby - Kenny Rogers
Don’t Take Your Guns To Town - Johnny Cash
How can anyone miss , “Happiness is a Warm Gun” Beatles. Four guys from England, 1960’s…
I feel that happiness daily as I carry!
I also think of the aftermath, “Lawyers, Guns and Money” Warren Zevon
@Scott52 I don’t know how I forgot that one!
Also, one of my all-time fave albums; Eagles - Desperado. Almost the entire album. Particularly the song Certain Kind of Fool.
“Rather Die”, by Poker Face. Inspired by the movie “The Patriot”.
“The sun rose high and burnt the night away
Who stood before me was my enemy - Don’t tread on me
He’s come to take away my liberties
I’d rather die than be a slave to thee - Don’t treat me this way”
http://pokerface.com/html/pf_patriot_lyrics.html
Folsom Prison Blues- Johnny Cash
Inner City Blues- Marvin Gaye
What I Got- Sublime
It Was a Good Day- Ice Cube
Christopher Cross Ride like the Wind
Born the son of a lawless man with a gun in my hand
Alice Cooper and Jethro Tull have their own versions of I’m Your Gun.
Among millennials and Gen Z, there’s Pumped Up Kicks by Foster the People
Probably dancing and singing along while not understanding what they’re singing. 
Kurt Cobain lied when he sang,
“ And I swear that I don’t have a gun” 
TNT- AC/DC
Wild Wild West- Kool Moe Dee