DAM Talk about a NECRO post huh...
I recently purchased the KA 70rds for my ECHO-1 MK14 ( EBR )
I too seem to be having a feeding issue, they fire fine on SEMI, but dont do a dang thing on AUTO.
the hi-caps that came w/ the EBR fire fine on AUTO, it's just these KA mags that are causing me a headache
Hoping this helps, thanx for the MOD