get a m4, high quality ammo (.28 bbbastards), and a tightbore barrel, and you'll be good to go...
BTW: that m16 is a JG too,
BBTW: stay away from that sig552, the lower body is crap, and the grip area is prone to crack and eventually could break, and also, the barrel is uber short, and the mags arent really common to find....
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