You walk around with a P90 like it's the 90's
The P90 is an extremely efficient submachine gun. Compact and deadly, this is a true gangster’s weapon. But it was first produced in the year 1990, so it’s just a bit outdated.
Since the FN P90 is highly illegal in the US, it’s also possible Lamar is referring to a Ruger P90 pistol, made since 1992.
To help improve the meaning of these lyrics, visit "Ronald Reagan Era" by Kendrick Lamar (Ft. RZA) Lyrics and leave a comment on the lyrics box