The British Army has been using the L129A1 for a number of years now as its sharpshooter rifle. A 7.62mm. It's as AR10 style rifle built by Lewis Machine Tool and acquired in quite large numbers. One or two are in each infantry platoon to give longer range fire as required. It's also used as the Sniper support weapon, in partnership with Accuracy International 338 Lapua. In the former its fitted with a 6x optic, in the latter with Schnidt and Bender 3 to 12x scope that double duties as spare for the sniper rifle in case its cope goes down.

https://www.youtube.com/watch?v=Ij7b1te6LHo

I would question whether the OP is correct. Certainly this side of the pond there has been nothing talked about it readopting . Indeed is FN FAL or SLR still in production anywhere. They were good solid battle rifles, but technology and the world has move on.

I believe the orginal pictures date from 2021 and it was a spoof or joke put out by a number of veterens

https://www.quora.com/Is-the-British-Arm...ssor-the-SLR-A2