5.7 x 28mm. See the link below for more information on this cartridge.
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in mw2 the p90 shoots faster but the scar hits harder. while using bling and having rapid fire and the red dot or holographic sight. so in my opinion with this attachments i think the p90 is better!
you have to be the first bloue diamond (2LT-I) rank
P90 Akimbo (Primary) M93 Akimbo (Secondary)
guns on call of duty modern warfare 2 are M4A1, ACR, FAL, SCAR-H,TAR-21,AK47, MP5K,UMP45,P90,MINI UZI, INTERVENTION.WA200,RPD, AND MANY MORE
194 my name is Aaron and i have beaten the round and i am at round 613 on medium