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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Instead of dropping at 280-290, they should drop at 300. Why? Because there is absolutely no point in doing IB...300 will ensure that it's higher light than vendors, but not raid level.