yeah I second the gunsmith option. I got that Pocket Infinity bounty about 7 o'clock last night, and was at the dismantling fusion rifles part not long after. Checked the gunsmith and only a rare shotgun for 2500 glimmer, but less than 2 hours till stock refresh. New stock, got super lucky, had a rare fusion rifle for 1600 glimmer. Now I'm just on the drudge of getting 200 fusion rifle kills in the Nightfall strike, which is also no fun when you're not lvl 28 yet. Wish I'd got the bounty a few days ago, so I could have just done the grind on the beginning of devils lair, instead of the summoning pits this week.