It's the dude with the eight-oh

from J.R. Writer – 9 Minute Freestyle Lyrics on Rap Genius

Meaning

Likely the SA80 selective-fire firearm. The most popular kind of SA80 is the L85 rifle variant (pictured below), which is used by the British Armed Forces

To help improve the meaning of these lyrics, visit “9 Minute Freestyle” by J.R. Writer Lyrics and leave a comment on the lyrics box