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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So you are saying that it's better to use a useless raid armor than the one you need. Let's take an example : I loot some raid harm that reload auto rifle and I play with hand canon, so if you are smart you infuse some crappy raid armor into a harm that reload hand canon. But I think you are not smart enough to get it.