I have a YHM R9 with a 3 lug adapter coming for my MP5 clones (Zenith MKE full size, and Zenith USA K model). I've been told I may need to swap out the locking mechanism, particularly on the K model.
Looking for advice from anyone who has been in this situation.
Will I probably have to swap some parts? Will I be able to make them run with and without the can?
Should be getting it sometime this week, so I want to gather info ahead of time.
Thanks.