My penny (cents) worth . . .
There's a film prop company in Ireland that make GOOD resin copies of a lot of weapons, I've had a Webley and load of Mills grenades off them, can't fault the quality and attention to detail.
I challenged them to make a mills that fully strips and can be 'cocked' with spring loaded plunger so the lever flies off when let go, didn't disappoint!
They are called GREEN PIG 316 if memory serves me well.
They ship worldwide