Kwame Brown Rips 1-And-Done Rule, You Can Shoot A Gun But Not Play In NBA!?

Kwame Brown is callin' BS on the NBA's one-and-done rule ... telling TMZ Sports, "To tell a young man he can go shoot a gun but he can't go earn a living, that, to me, doesn't make any sense."

Of course, the infamous NBA rule is back making headlines this year after Zion Williamson made it emphatically clear in just a few weeks at Duke he was ready for the pros.

But, the league still has its draft rule in place -- saying players need to spend a year in college before they can play for one of its 30 teams -- and thus, Zion remains a Blue Devil.

Enter 37-year-old Brown -- who went straight from high school to being the No. 1 overall pick in the 2001 NBA Draft when he was selected by the Washington Wizards.

Brown thinks the 1-and-done rule is just ridiculous -- telling us there's simply no place for it in today's society.

"Free enterprise," Kwame says ... "Go and get that money."

As for Brown ... we had to ask if he regrets not going to college straight outta high school given his NBA career didn't flourish the way he expected it to -- and his answer was a big, fat HELL NO!!!

"Factor out the numbers, I know economics," Kwame tells us ... "I own four companies!"