If you prefer Quality Aluminum 30rd and straight 20rd mags... I'd buy some now. ( Not saying there will be a shortage, but , quality "might" slip )
Okay Industries has been making mags for Uncle Sam since WW II. ( M1 Carbine )
IMHO, their 30rd and 20rd Aluminum AR15 mags are the best metal mags produced.... heck they are the standard that every other Aluminum AR15 mag is judged against.
I hope someone will buy the equipment and continue to produce them.
As to why, Okay Industries is going to focus on the Medical Division products... and are fearing there "might" be conflicts between the Mag Division and Medical Division.