Doesn't feel right for some reason...
My suggestions:
- get rid of the rail covers
- swap the tan pistol grip for the original black and paint the black with krylon tan camo paint (the natural wear will look awesome)
- paint atleast your lower krylon tan camo (again, the natural wear will look awesome)
- swap the qd td for the non-qd td grip
- use a normal color usgi mag
The 553 and M6x should make it look great!
This might help also:
Mk18 Mod1 setup? - M4Carbine.net Forums