Are there single or double locking cuts on the side of the mags? If there are two cut outs, they could be 8 round factory OEM mags for for a Performance Center 945.
I don't own any 945 mags, yet
, so I don't know if those would work in any other 3rd Gen 45.
I don't think recoil spring weight would effect mag feeding function. Regards 18DAI