I don’t have a clone, but I love the look of the MK18 Mod 0 and Mod 1.
I started off with a Colt LE6920 lower, and had a Norc 10.5in upper on it for a while:
http://4.bp.########.com/-xDoB0CDGgrI/VFm9RmldCfI/AAAAAAAAVR0/ZZBvbcPdDdo/s1600/PB045709.JPG
Ended up selling the Norc upper to help finance a CC IUR:
http://4.bp.########.com/-uG4wvapfiTE/VP_Q02zklqI/AAAAAAAAWVk/vQzruAXlsCg/s1600/P3105577.JPG
ThenI bought a striped CC lower, slapped it together and the IUR ended up on top of that so my M4 was topless again. I bought an LE6920 off a buddy so my LE6920 was whole again:
http://3.bp.########.com/-NRCxkMKgPDY/Vhnn1g1nPeI/AAAAAAAAYtI/LeY71pdqACE/s1600/PA100946.JPG
http://3.bp.########.com/-99ab1ZPMrjw/Vhmv4tR7iyI/AAAAAAAAYog/JN8qyqRmK1A/s1600/PA100948.JPG
And within hours of buying the LE6920 off my friend, I found a sweet deal on a 10.3in Stag N8 upper so I ended up buying that too:
I tried it out on my IUR:
But I think I like it on my Colt LE6920 lower: