http://www.adxtactical.com/store/pc/viewPrd.asp?idproduct=1974&idcategory=Have a look at that link, I too thought it was an L2A1 but I'm still not convinced. If you look at the barrel from the receiver to the gas port you can see in the photo it appears to be the same thickness. Now look at the photo in the link and you can see the barrel is the same thickness as the barrel at the receiver and extends at that thickness all the way along but then narrows down about 50mm or so back from the gas port.
Having said that the connection for the GL does obscure the point where the barrel would neck down.
The main reason I think it is an ordinary L1A1 is that I know from my own experience you can fit your fingers in between the gas tube and the barrel on the L1 but not on the L2, I reckon the weapon in the photo has too big a gap.
I do know the L1A1 was "converted" in large numbers from my instructors when I was in the army most of whom were left overs from the Vietnam War.
Having said all that I reckon it's too close to call either way and for the sake of Stefan's build pretty much 6 of one and half doz of the other.
As we well know well anything goes with the SAS boys and their toys !
The M-14 and XM-177 are spot on, not so sure about the grenades on the pouches or the ethnicity of the first trooper.
