i had a 16inch m4 barrel for my 98 it was 30 on sale and it was worth it...im not sure about the newer m4 barrel but there r pretty accurate

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A-5, SPECOPS COMMANDO STOCK, OPSGEAR MP5 GAS THUR MAG, SPECOPS MP5 SD SHORTY SHOURD, X7 HOPPER, SPECOPS DAGGER VEST. ( ALL GUN PARTS IN OD GREEN) PROCAPS REMOTE LINE, 120CI 4500 PSI HPA TANK, E GRIPED W.A.S. BOARD