The best replacement for apex barrel is flatline.

The best alternatives to apex barrel are rated as following:
★★★★★  flatline
★★★★  apex 2
★★★  flatline barrel

Your alternative for apex barrel is not listed? Suggest!
Speaking about apex barrel, one probably shouldn't forget about project salvo.

Other search terms related to apex barrel and their ratings are:
★★★★★ project salvo
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apex barrel
flatline
apex 2