Kwa M226 (Sig P226) Ptp Venting Gas

[Longshot]

I have a fairly old KWA P226 that’s always been solid, but now is giving me issues. It’s a gun based issue and not mag based (tried 4 of them). Essentially it just vents all the gas in the mag on one shot. From what I can see, the piece in front of the hammer that hits the gas release on the mag isn’t returning from its activated position like it should. The piece I’m referring to is in the centre of the photo. Any ideas before I try to open up the entire hammer group?

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[Misery]

could it maybe some dirt fouling the return spring?