I have just installed the Canis M4 adapter and had no problem with the installation. Did the milling and it snapped right in.
My problem came when the bullets would not feed, hitting about a 1/8 of an inch low on the breech .So I ordered a bullet guide from Carolina, which i had planned on.
The guide did not work be cause the taper was to much and was not lifting the bullet. So I made one out of bar stock the same as the one I purchased but with no taper and it worked just fine.
Also broke the tap off flush with the hole ( first time ever) so I froze it and punched it out ,got a new tap and finished the hole.
Looking forward to shooting it in a few weeks.
For the money and the fact I can shoot both AR and AK mags is a win win.
I had fun doing it
Also you will have to trim the AK release rivet's to get the adapters release to travel inward. Pmags drop free.