It's the lower half of a two piece hopup unit.
As long as the lower part isn't flopping around, it'll be fine even if the plastic is cracked. As long as it's there and not moving around, you're ok.
Back the screw off a bit so as not to over stress things. You can try to crazy glue it, but it may not hold and it's not necessary to do so. DON'T glue it to the receiver...that piece needs to come out for the mechbox to come out.
I'd hazard to guess that 60-70% of the setups with the two piece hopups have a crack (or two...one on each side) just like yours.
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