Green’s Dictionary of Slang

corn n.3

[? it resembles a small ear of corn or their being 'scattered']

(W.I. Rasta) a bullet.

[WI]Francis-Jackson Official Dancehall Dict. 9: Cawn (corn) [...] 2. bullets: u. me bu’ two cawn.
Jah Lyrics Dict. 🌐 corn [...] 3. a bullet.
Section Boyz ‘Trapping Ain’t Dead’ 🎵 You can get corn if a man wanna beef me.
[UK]Skepta ‘Lyrics’ 🎵 Swinging out my sword, swinging out my nunchuks / Running out of corn? Man’ll get a gun buck.
Digga D. ‘Lets Say’ 🎵 Broski caught him and nearly demolished him / Corn in his whip, nearly gave him a wallopin’.

In phrases

crash corn (v.)

(UK Black) to fire a gun.

1011 ‘No Hook’ 🎵 My bro’s them been crashing corn.