The 5 round hunting magazines that are seen were just cut down 30 rd mags. They have the hold open followers. The hard back mags are good, the split backs not so much. Some quality 30 rounders were made marked with a Castle? or building? Maker unknown. If you try to use 30 rounders without the late mag catch, the loaded mag will flop all over and still work but will probably have FtoF and jams. I just don't understand how making a beautiful handy carbine into an unbalanced heavy weapon is any improvement? In an M2 yes but in a 5.5lb standard why? Re: chrome lined barrel? Are you sure? Late 44 Inland was using anything they could find and even used some previously rejected barrels that still worked fine. Shallow rifling like a .45 barrel looked different than a standard barrel made by Underwood, IBM or Rockola. After April 44 Inland and Winchester were left making the last Carbines and all of the M2s. They both use parts bought from the other makers who had their contracts cancelled. Inland's peak production was Nov 43 when they made 121,000 in one month.