The only "funny" I ever saw, (and fired) was an L2A1, that had been around the block with someone and came back with a flash-hider from an M-60 attached to a slightly shortened barrel.

It had modified late-pattern L1A1 hand-guards held on with stainless-steel hose clamps, instead of the C2 type bipod / hand-guard rig. L2A1 dust-cover and sight retained. L1A1 trigger housing and components.

Looked nasty, shot fine.

Do not know of its "heritage", but doubt it was an "official" mod, even for the "interesting chaps" from Western Australiaicon.

There was also alleged to be an L1A1 issued to a rather "gung-ho" Oz Infantry company commander (Major), which was bog-standard, but had a set of hand-guards with brass plates attached to them. On these plates were engraved the words: "Happiness is a warm barrel and a high body count." I suspect there may have been a set of "issue" hand-guards available, come "tech inspection" time.