It was a joke. However, why did Ruger manufacture a rifle that took S&W mags? Why does Keltec manufacture a rifle that takes Glock mags? Sometimes it's just easier to build a rifle around a very popular and easy to get mag....I guess!
I'll tell you what though during the craze I had no problems finding Glock mags at the local gun stores for the same price they were pre panic. Can't say that for S&W or others. It's also a good selling point. I know a lot of shooters look into mag availability and price prior to buying a firearm
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