It's the valve being too stiff, when you top the mag off with propane the pressure causes the spring to be too stiff for the stock marui valve knocker (atleast i think that's what it's called) to actually even press it in.
It happened to my 18c aswell when I bought cheapo mags for it. Just release some of the gas to relieve the pressure and it should work. Worked for me atleast.
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