The pic I have here, from "Osprey's, Elite Series...Security Forces in Northern Ireland, 1969-92", page 10. Shows a soldier of the DERR with a M16 A. It shows the stock of the weapon secured by a lanyard. I take it this was connected to the jacket...just in case!
It says that the M16 was was issued to units on rural operations in NI.
LOL we call slings a sling here too :laugh: