Chris - Your Mossberg mags look just like the two repro mags I have for my 44US. I've read that the original USGI Mossberg 44US mags didn't have any accommodation (threaded hole) for the .22 short adapter. Don't know if that's true but I've seen it stated a couple of times. I know nothing about the mags for the commercial Mossberg variants, but Havlin is currently selling new repro mags that they claim will work for the models 42 (all variants), 43, 44B, and 44US for $38 each. As yours are used and the adapter stems have been cut, you'll want to price them accordingly.

And yes, when you list them I might be interested in buying one or two if the price is right.