The bushings should be staked (and are on GI guns) but most clone makers don't seem to want to bother, so they just screw them in. That is why in so many cases, the bushing comes out instead of the grip screw and everyone rants about the "poor design."
In fact the reason for the bushings (and the reason the Army insisted on them for the M9) is that if a grip screw gets cross threaded, the bushing can be replaced and the frame is not ruined as it is on the Spanish and some other pistols where the grip screws thread into the frame directly.
Jim
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