sten gun

[Vincent]

I had to do a quick Google for that maker Vince, very interesting, I wonder if its possible that these Stens saw French post war service and had a similar (but slightly Heath Robinson ) retrofit in their service ?
Thought it was a little Foreign Minded...

Yes, it’s most likely a foreign modification. My guess is it was done before the gun was modified with that Mk5 Safety Cocking Handle. The return spring is only collared at one end, so that might help date the modification.