Tim McGraw -- Welcome to My Gun Show!

Even without his wife Faith Hill as his opening act, country hunk Tim McGraw still got upstaged at his own concert this weekend ... by his yoked body.

Rockin' his trademark cowboy hat and a tight white tank top, the 46-year-old singer showed off his ripped and buff tan biceps at the Atlanta stop of his Two Lanes of Freedom Tour on Sunday.

With such an amazing body of work, no one would ever argue that Tim has every right to bare arms.