I know that in the Falklands, British troops were using the Argentinian version of the L1A1 SLR as it had a fully auto capability, and it used the same ammo.
I remeber seeing a picture of a vast pile of them, and the the heavy barreled version, outside a sheep shed near Port Stanley after the surrender.
I was attending a training session with the Armed Response Team and they had a collection of confiscated weapons, real and fake, and one of these "Para versions" was among them.
They found it in a loft during a raid on a house for stolen property.
The guy was a Falkland's veteran and had brought it home as a souvenir!
Sempre in merda profundum