Well theres many kinds of m4 and just about all the weapons in KF is in Call of Duty (except flamethrower and mp7) and any Tom Clancy game so a M4 wouldn't make much difference.
I was thinking about a M4A1 Carbine like this: http://www.modelguns.co.uk/images/tactM4k.jpg
With flashlight, medic dart and reddot. A compact weapon that would suit the Medic. It should just be expensive so it only can be purchased at later waves.
Sounds like you want a SCAR with a medic attachment.
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