Magazine springs too strong.

[AFJuvat]

I picked up a few USGI spec 3 Round M1 Carbine magazines.

They are marked 'UU', which means they came from Korea, The body and dimensions are exactly to the original USGI spec.

That said, the magazine spring is too strong - Pop a round out of the magazine and 2 - 4 rounds pop out. Last time I took it out, the bottom of the bolt was gold colored from rubbing on the brass.

Anyone know a reliable way to make a magazine spring weaker?

Thanks