These are unmodified, unmolested 30 round stick mags for "real" Thompson 45acp sub guns.
There was a time you could send these to Auto Ordinance Corp (Kahr) and have them modified to fit their modern semi-auto version of the Tommy Gun, I don't know if that is still the case.
That is what I bought these for and I just never had it done, someone told me these are "real military surplus" and they should not be modified.
So I have had them sealed in my safe for the last 10 years and its time to move them to someone who can actually use them.
$60 for the pair - shipped to you - if they are not legal to own where you live - don't offer to buy them - KNOW YOUR LOCAL LAWS