Wa m9 information help please

[bigbadbob]

Hi new to forum so any help would be great 

I have a wa m9 for spares and repairs, the issue is it fires but not as it should been told it's a spring on top of the pistol which I can not source.

Comes with three fully working mags but no idea what it's worth as I ve had it that long. 

Any ideas or even where to send it to repair

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