MP5 Full Stock wobble

[Olisharpeye]

I've done searches and come up empty. I've read other related help on retractable stocks but mine is a full size stock. I've recently acquired this MP5 in a trade and is having this stock wobble issue. Which I find odd for a full stock. The make of the MP5 is CYMA metal upper, TM Lower. I believe its a CYMA stock. I know CYMA isn't a very good brand when it comes to quality.

Does anyone have any remedies or recommendation?

I've done electrical tape on the receiver to try and fill in, it's a minor improvement. But everytime the stock is removed it has to be repeated.

I've recently read that female Velcro works. I'm curious to how you would apply it to this situation.

Thanks in advance.