Pinned Wrong?

[u/dazednewf709]

I bought 2BX-25 mags from a Canadian online supplier. Tried loading them today and they won't accept the 10th round. I reached out to Customer Service and was told "Unfortunately due to the way these magazines are pinned, many of them end up only holding 9 rounds." Isn't it more likely somebody is drilling and pinning your mags wrong"if the rivet was an 1/8" lower it would take the intended 10 rounds without issue.

Am I wrong to be peeved??

Am I allowed to move the rivet and pin it to its legal capacity?

[u/AmbitiousPresence737]

If someone has old 25rnd mags is it legal to rivet themselves or should they just turn themselves in? Asking for a friend