The holster/stocks were modeled after those of the Mauser C96 pistol which was a very popular sidearm in China between the first and second world wars. The Inglis company manufactured all of the metal parts for the assembly and were overall responsible for the production for the holster/stock. Due to the lack of woodworking abilities at Inglis, the two wooden components of the holster/stock as well as final assembly was sub-contracted out to the Small Arms Limited(SAL) Crown corporation which was located in Long Branch, Ontario Canada. The Inglis firm had some initial trouble manufacturing the metal components for the holster/stock's causing the first shipments of completed units to be delayed.
In the SAL quarterly report for December of 1943 that was sent to the Minister of Munitions and Supply, SAL stated that they had taken on the task to manufacturer 150,000 holster/stock combinations for the John Inglis company. They go on to state that the engineering has been completed and that the tools, fixtures and gauges are being received in the plant. The report also pointed out that they plan to start production of the holster/stocks in early February of 1944 which will involve 53 machining operations. Their goal was to build up to 600 units per day. Taking into account the time table for the scheduled delivery of the metal parts from the Inglis company, SAL also reported that the production of completed units would be up to 22,000 per month by August of 1944. It was soon realized that only 140,000 holster/stock combinations instead of 150,000 that was in the report, and 40,000 web holster was all that was needed to fill the Chinese contract for the 180,000 pistols. The first shipments of completed holsters took place in July and by the end of that month they had produced 7,745. On September 7, 1945 the contract was canceled with SAL having in their inventory some 1,053 surplus holster/stock combinations. These were later disposed of through the War Assets Corporation which is now known as the Crown Assets Disposal Corporation that is still in operation today.
These original holster/stock combinations were only manufactured by SAL between the years of 1944 and 1945, with a total of 29,038 being produced. Today, well made reproductions can be found quite easily that are often being passed off as original.
Copied from
http://www.ai4fr.com/main/page_militaria__collectibles_canada_inglis.html as I couldn't have put it any better myself.