Gentlemen, I have also been searching for the elusive magazine-carrier for the Johnson LMG. When I bought my M1941JLMG from the first Class III Auction James Julia ran, there was a magazine pouch offered as well. The catalogue figured around $2,000 or so dollars. I put a reserve of $3,150, figuring I had it. It sailed past me into the mid $4,000 and was gone! The Bruce Stern Collection represented the vast majority of all the Class III stuff offered. My JLMG was a pin-up girl, unfired, from the Winchester Reference Collection which Stern owned. I had no idea how rare the mag-carrier was. This was years ago. Finally, I've got one! I have conversed with Bruce Canfield on numerous topics, this being one of them. He allows as how his example is virtually identical to mine, as well as the Julia Auction specimen. Canfield asserts that U.S. Military usage for these is dubious, opining Netherlands origin. As you all may have read, our soldiers employed whatever pack was handy, meat tin pouch, musette bag, etc. Correspondence also indicated a crying need for some formalized kit to be provided, but nothing was forthcoming. I am always open to hear anything else any of you might know on these to illuminate further it's usage, era pictures, etc) Here is the piece: (the last two pictures are from the Julia Auction Piece for reference)
