Let me start off by saying I'm not able to login in and play Destiny everyday.....which leads to my issue. Currently you can only order weapons from the gunsmith on Wednesday's. Bungie, I completely understand the logic you were thinking. Make it a mandatory day every week which keeps people logging in and coming back. Problem is a large majority of the 25 million guardians cannot login everyday. I highly recommend you change the gunsmith process and have it reset weekly just like Nightfall, Raids, weekly bounties, etc.
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I'm almost positive you can order weapons other days besides Wednesday. I believe its up to Friday.