Some confusion there. The one you have marked "OFF K1 ENGINE " is a later set of barrels K3 to K6
And the one you have marked "K6" is a K1 or K2 set of barrels. You can tell if they are K1 or K2 by the front of the barrels, K1 has a flat area and a K2 is rounded in the same area as, in the pictures.
Also i have put a picture showing the different liners. 1) is a early liner and 2) is a later liner. You can tell by the 2 cut aways on the number 2 liners
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