On rooftops, tape CD covers to trees
Line the barrel up with your weak picture then squeeze

from Nas – Nas Is Like Lyrics on Rap Genius

Meaning

The target practice would involve putting a CD cover on a tree and using it as the target for his Mac-10 fire.

Nas in an essence is saying that he’s practicing for the day when he will have to kill/eliminate wack/weak Emcees from the game, and also declaring that he has his aim/sights on wack/weak emcess that are in the game, so its always a warning to watch your back if you’re one of the emcees that Nas considers wack/weak.

It’s goes even deeper than that. Nas is taping the CD covers to wack albums and in a way you can say pictures of wack rappers to the trees near the complex, assuming it’s the QB Pj’s and then he goes to the rooftop where he practices his sniper skills by shooting at the pictures from the roof.

Nas isn’t going to kill you, he’s going to assassinate you.

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