adversitystrikes, kitchen_wolf - try not to blow up the truck, you can just hit the MG shooter :). There is also a helping arrow that shows the hidden enemy, if you don't hit anyone for a few seconds.
OjisanKG - it does. Muzzle velocity for the MAC-10 (the first weapon on Recruit ) is 366 m/s. Which means that it takes 0.54 seconds for the bullet to reach the 200m distance.
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