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nope, unlocked for me in a combat simulator match- i hid in one of the rooms on facility, all weapons as laptop guns, 4 fistsims on meat difficulty, first to 50 kills, and just kept throwing a new gun on the wall every time the old one ran out of ammo. had you shot any of the enemies yourself? it could be that the sentry has to do all the work itself for the kills to count.
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