A 3D printed extension for a 10 round AR-15 magazine, that allows it to hold 40 rounds. All that is needed is basic PLA and a 30 round spring, and the spring can be made at home with a printed jig.
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You coukd make some decent cash selling these.
Maybe they could ban piano wire or just springs in general?
Most likely, they'll just try to ban everybody from describing functioning mag extensions to each other as if the first amendment doesn't exist.
This video will inevitably push California to ban plastic entirely