The gunsmiths rank should increase the light level of the guns you purchase on arms day. If you are rank 6 then the guns he drops are 286 instead of 280. At rank 40 the guns are 320. The current light leveling system is a mess. You get stuck at a light level for weeks of you don't get a drop. This would provide a direct predictable route to leveling guns and provide an alternative for solo players or people who have trouble getting raiding groups together to level.
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Edited by JensBoef: 3/25/2016 9:35:21 AMThat would be too easy. As far as I know you are rank 40 when you unlock the gunsmith test weapons. So every weapon you buy gives you 320 infusion material. :-S EDIT: Sorry, did you meant gunsmith rank or guardian rank?