L4 mag issues

[ActionYobbo]

It would be helpful to know what striker and spring system/version you have.
My brens all have the pirate style setup and the maximum pull weight on the charging handle is 18 pounds with or with out the striker and spring using a fish scales.
I would suggest looking to see if your striker is binding or getting tilted by the carrier and also see if you are getting coil bind on the spring