Milsurp After Hours

I visited the Berwick Barracks museum this weekend, dedicated to the Kings Own Scottish Borderers.
Amongst the displays this foto caught my eye. The butt and foresight / guard look like a No.4 but the forend wood and possibly a pistol grip look unusual. The only info about the pic said it was a mortar pit position.
I can't find anything in Skennertons book, anyone have any ideas what it is?
Joe

Working on it Joe, watch this space mate!

Consensus so far Joe is a Mk. V Sten................ 9 Replies form 2 different forums.

https://www.youtube.com/watch?v=JDSPwexlyTo

Good research , Duncan.

Thanks Duncan I never even thought of an smg, now that you say the mag is visible just behind the grenade.
I should have mentioned that this was a pic from the Korean war btw.
Joe

I have some well informed friends Joe

I want to know what Johnny Carson is doing down in the bunker wearing what looks like a lamp shade on his head....