L4 mag issues

[browningautorifle]

B. find a spring of somewhat lesser spring force, that will compress easier, yet still have enough power to drive the striker home for a positive strike and cartridge ignition

I'd try this one first. I've hed things that gave similar issues and tried this to success... You can get springs wound by guys that do that and use smaller wire by number until you have success.

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[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