All 30 rd M14 mags are aftermarket and junk !
I am sure you could probally get one to feed the 5 rds that they must be pinned to , but all that I have tried were JUNK as were the 20 rd mags made by USA company .
I would stick with Chinese or USGI mags if I were you :0)
Don't waste your money fellas , I had purchased a few when I was new to the hobby , and they were a total rip off . They do look cool but other than that they have no purpose .
I havent tried the 25 rd mags that 44mag.com sells , but they are made by Checkmate , so I would expect them to be good .
I hope this post helps someone from not being ripped off on 30 rd mags .