its like they impact their own barrels and kill you
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You are now getting barrel stuffed by the projectiles of the enemies. I have used heavy GLs A LOT since they came out and have never had it happen till the release of revenant. They loaded the artifact with launcher perks they had to make a downside. Quite frankly if it’s a “bug” it is an annoying one for sure. I’ve found jumping and firing to be a valid way to avoid getting stuffed.