I know the L4's where a cherished piece of kit for the guys at shooting comps. They won nearly every MG shoot until they finally withdew them form service an dthe last I saw was late 90's early 2000. In a reserve unit. Kept up to then as an enemy weapon with Blank fire barrel. the only disadvantage was the number of mags to be carried. they where issued with a box of 10 but with front line ammo issue being 800 on the gun and about 400 interspersed in the section it became a hassle to carry the mags. Thats why the belt fed was easier to carry and disperse the ammo load. IMHE
Cheers
Ned