The EY rifles were still in the UKMIlitary inventory until the early 70's as we stripped and rebuilt a load or war reserve stockpiles then. Totally refurbished them and re-bound the copper wiring too. Alas, there only seemed to be one grenade cup available for us to test fitting!
Would have been good to show the results of the grenade exploding in the cup. I put a few photos up a few years ago Paul