Machine Gun Reserves armor mod does not work at all when two are active. It will still function with one mod. Tested using Xenophage and Actium War Rig. Xenophage by default has 28 rounds in reserves, one mod increases it to 32, and two should(?) increase it to 34. Equipped items shown incase they may have an effect on this bug.
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Same problem here. Bungie need to fix this.