Call CDNN first and verify that they are out of mags. They have a "sales" inventory and an "actual" inventory. I bet they just find some more after this panic. I don't know how many times it has been floated that there are "only 3 NDMs left". They might as well be screaming "the sky is falling" I've heard it so much. Realistically we are looking at a 5-10 month supply unless purchases go up substantially. That is from a good source on the "actual inventory" side.
Even if they don't, a .308 Galil mag is supposed to be easily reworked to fit.