In Canada, Kalvinator of Canada made these drums. They also made sten mags, as evidenced by the KC found on most Cdn magazines.
I have an original Kalvinator of Canada packing list from the bren drum chest. Note the date of 1943, which shows these stayed in production perhaps a little longer than most think. The holding tool was also built onto the Canadian mk2 Universal (bren) carrier....further evidence that the drums were still in use this late in the war. Of course, all this was still a while before D-day.
I have several of the Canadian wooden chests for the drums.....they pop up at gunshows, farm auctions, etc. Rarely with the dividers mind you. Who knows where all the magazines went.
I do not have a Canadian Kalvinator drum mag....all mine are British made (I think). Further evidence that I don't get nuthin......
Not surprising, really. so much of WWII procurement went along the following lines:
Step #1: (Frontline command) Oh, lord! We don't have enough of Gadget X! We need Gadget X! We need 1000's of Gadget X, or we're doomed... DOOMED!
(weeks pass)
Step #2: (REMF) I say, old chap, the lads are asking for Gadget X. Do we have any spare? No? Lost all our spares in Dunkirk you say? Tusk tusk. The Lads really should be more careful with their kit. Well, forward this on to the Ministry, and have them take a look into getting some extras whipped up. In the meantime, give the Lads a few of Gadget W we have left over from the last dust up, tell them to make do, we all have to make sacrifices and whatnot.
(weeks pass)
Step #3: (Ministry Office) Request for material, well, the Minister is awfully busy at the moment. Terribly busy man. Very important you know. Has the Ear of the Prime Minister, and Tea with the King. Not sure we want to interupt him with some request that's worked its way up from the Other Ranks. What? Oh, an Officer asked for it? Well, why didn't you say so. We'll get that put on the agenda to discuss post-haste.
(weeks pass)
Step #4: Various ministerial sackings bury the request in the pile of un-discussed items.
(weeks pass)
Step #5: (the latest Minister finally gets wind of the request while chatting at "The Club" with one of his subordinates). I say! This looks rather urgent. Pencil it in to discuss in Cabinet.
And on and on.
By the time the needed item wends its way through the bureaucracy, funding is allotted, the orders are sent out, factories tooled up, and it goes into production... Years have elapsed and the item has been superseded by something from the Lend Lease program. But the wheels are in motion, money allotted, contracts awarded, etc. so the item gets produced, regardless of the fact that it's no longer needed or particularly relevant to evolving events in the field.