How so?
Atlas-K3 is a modified K2, which is a Lyran mod of Kurita's K ( 1 ).
K4 is a Dark Age mech, which would have need of a Phoenix facelift, but a K ( 1 ) is just a Kurita XL version of the original classic D. K2 was a revamp of a Gauss and ER Large with 2 SSRM6's added a Guardian. K3 dropped the Streaks and added the jets instead.
Again, how so MLO4H?
TT