One time I was in Walmart and asked if they sold gun magazines, and the guy said "they're up at the front of the store", which I thought was weird. He was talking about printed magazines. I was talking about metal things that hold bullets.

After that I just say "clip" even knowing it's not technically correct.

More info: there was a time when Walmart sold all kinds of gun stuff. I don't know if they do anymore. I used to buy 500 .22 long rifle bullets for $15.