M-16's and them 6 teens

from Tyler The Creator (Ft. Hodgy Beats) – P Lyrics on Rap Genius

Meaning

Tyler and 5 other members of Wolf Gang are strapped up and ready for ruckus.
And M-16 is a semi-automatic military rifle perfect for taking multiple lives at a time.

This line may also be a reference to an old Eminem lyric

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