I've read (and see a few blurry pics that seem to confirm) that British and Australia SAS units do not use the SA-80 or Aug, respectively, but our M4 carbine.

Aside from using the Elcan optical sight, does anyone know how else these units outfit their M4s?  Do they use the Knight RAS, AN/PEQ4, etc, or do they have other mods?

Any feedback is appeciated--I've been toying with re-tooling my M4-gery to look like it was in Her Majesty's service...thanks.

Will

They (UK) have Diemaco M4's with a (our) KAC M4 RAS with the special lower that also clamps to the barrel nut like the upper RAS does.
My guess for the Australians would be Colt M4's with KAC standard M4 RAS, as they have bought both Colts.  And then bought M4 RAS from us.