Okay so we're losing the most powerful effect of Rally Barricade and Lunafaction Boots in about 5 days, rip :(
Actium War Rig could provide a really good pick for some weapons such as 21% Delirium if it reloaded a small part of the magazine of all automatic weapons as long as you're using the weapon. So Auto Rifles, Trace Rifles, SMGs, Machine Guns.
Hell, maybe all bullet weapons! There are some automatic Pulse Rifles, Sidearms and Scout Rifles! And lots of people love Hand Cannons!
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Sweet Business and autorifle buff coming with Shadowkeep. Paired with AWR it may actually be usable.