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In the meantime, I've found a workaround. I made a shim by cutting a slip of plastic out of the heavy ziplock bag that Lancer AWMs come in, and placed this shim in the bolt catch's slot in the lower receiver, behind the bolt catch. This effectively pushes the bolt catch forward just enough to *mostly* prevent Lancer AWM followers from snagging on the bolt catch, but leaves enough wiggle room that the bolt catch doesn't bind, probably aided by the plastic's lubricity. Ghetto, I know.
That's going to be fun when it dislodges and makes it's way into the FCG or chamber.