Chris Brown -- I'm Bringing in Armed Guards ... Robbers, Prepare for Shootout!

Chris Brown has finally learned his lesson ... he's amping up his security with armed guards who are prepared to shoot.

Sources close to Chris tell TMZ ... he will soon have 24 hour security at his home ... with one guard inside and another in a vehicle outside. We're told the guards have their marching orders ... open fire if necessary.

According to our sources, Chris has taken advice from professionals in his life -- as well as his mother -- and agreed to significantly limit the number of people he invites to his home.

As TMZ first reported, both Chris and the LAPD believe some of his friends were in on the break-in earlier this month.