Damn, Manny! I remember when we used to import MP5's, Uzi Pistols (both 9mm, and .45 cal), SAR-4800's, and SAR-8's (the real ones, not the crappy cast aluminum reciever pieces of shit everyone is selling for 400 bucks these days) If I would have been smart I woud have one of everything I just listed.
As for other manufacturers upping production, I haven't heard anything to back that theory up. In the past we have barreled up every M1A receiver that we had in stock, and waited for ATF to come in, and make the call as to whether or not those particular guns made it under the wire. When I was working for Armalite '95-'96, we had quite a selection of Pre-Ban AR-15 lower receivers that went for twice the price of Post-Ban receivers. Basically, all you have to do is have a serial number stamped before the pertinent date, and that serial numbered firearm is termed Pre-Ban.