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I found this video helpful.
It shows you where the gun (X-43 MIKE) is in the Dark Heart chapter and what it looks like. If you can't hear the video for whatever reason, the important thing to note is that you can't replace ammo for the gun, so you want to take out as many bugs as you can with it to help conserve ammo.
Even after that, I didn't end up having quite enough to get 20 kills going forward, so once I ran out of ammo, I just hit a checkpoint, reloaded the level via chapter select, and ran back and repeated. It counted the kills I already had.
You will have a chance to pick up the gun again several chapters later in Masks Off, but if you want this as soon as you can get it, this is the way.
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