IB gear = fake 310s which means you are booted from my fireteam.
IB gear drops at 280 so you will have to infuse your way to 310 which isn't worth it. Plus using IB gear in the raid is worthless anyways.
Edit: only true year one vets know what I am saying. See all the salt posted below!
Edit 2: updated satire tag. Salt game is strong!
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I was that guy who wore IB gear into the raid for a really long time. I was always like, I know my gloves suck and don't match, but I want to level up this obscure weapon that I won't ever use with my shards instead.