I have my semi's basically for home protection, particularly since we are somewhat isolated and did have an attempted break in. A few days ago I was invited to NJRPC by a friend to shoot at their indoor range, which is really great. Anyway he asked if I had my 15 round mags changed to 10. I told him that I didn't and had never really thought about it since this was the 1st time I was taking them out since the law was enacted. He strongly suggested that I get them fixed or buy new ones because if pulled over while driving with them (not being checked at a range) I would be in a world of hurt if they were found and subsequently checked. Found this company https://www.magazineblocks.com/magento/ ordered the ones I needed and epoxied them securely in place and kept the receipts to carry with them if I do take them out again.
All you would need is just one time, getting caught with them in this ridiculously stupid state and aside from possible incarceration and monetary fines you might lose all your guns if you get the wrong judge and jury.