Expert ? Me ? No how , no way
I would measure/inspect the op rod tab it may be out of spec
Also check the op rod guide for alignment and side to side rotational movement
I noticed Hahn filled in the mid dismount notch for compliance , I believe your guru freaked out with the selector mount and components still present on the receiver
You might want to neuter that
I would measure/inspect the op rod tab it may be out of spec
Also check the op rod guide for alignment and side to side rotational movement
I noticed Hahn filled in the mid dismount notch for compliance , I believe your guru freaked out with the selector mount and components still present on the receiver
You might want to neuter that