With the closure of the major modelgun manufacturers, it's inevitable that supply will dry up unfortunately.
Marushin still make models but only in short production runs. MGC and Hudson have long gone.
There are smaller manufacturers, Shoei, CAW, Hartford, Tanio Koba eg still producing but being small companies specialising in really high quality models prices are high.
Good used modelguns are still available, but undoubtedly becoming harder to find
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.