Dischargers, smoke generator, 4 inch

[horsa]

Nothing documented thus far but along that same line of thought...

The U.S. built T-16 Universal Carrier first went into production during 1943 and it had fittings for the Boys A/T rifle and a 4-inch smoke discharger. The example I used to own was built in Mar '44 and by that stage they had abandoned the Boys fittings in favor of mounts for the PIAT but it retained the 4-inch smoke discharger. Sometime just after that time they began producing the vehicle with fittings for the 2-inch mortar which served as a smoke thrower. We've seen production vehicles from Jun '44 built this way but don't know when the actual transition occurred but it was sometime between March and June of 1944 in this vehicle's case.

Being built by Ford in the U.S.A., it probably took longer for a change request to be processed so I'd imagine the mortar was approved sometime in mid-1943 for UK and Commonwealth vehicles.