SheepDog4Life
Natural Gray Man
Yes, wish I had came up with it, I didn't, but by golly I sure will "steal' a good idea when I see one!Hmmm, good idea! Wonder if it would be possible to add a couple more holes, like for half full and another for 3 rounds remaining?
Regarding the 3/5 rnd witness holes, I would say yes since it's a rotary mag and those are distant from the feed lips, with a couple caveats.
First, you'd probably need a clear mag to establish an index for the right spot for those on the face plate. The "full" witness is easy because of the shoulder on the mag gives a radial center line for the hole.
Second, for those witness holes, I'd say only drill them when disassembled to avoid nicking the follower fins. I did not do so for the full witness, but disassembled afterwards for cleaning, and they were fine... YMMV.