I expect to hear

and

talking about doing their knobs.....not you. I guess I now know.
My metalworking ability is pretty limited, so I didn't even consider doing the mod myself. The smith was pretty quick.
The Magpul 7.62 AC mag arrived today. Yep, I ordered it yesterday at 5:30 PM and received it before 1:00 today. I cycled about 25 dummy rounds through the rifle, and it worked well. Evaluation rounds I loaded to near AICS mag length fit comfortably in the Magpul mags.
It's longer than an AICS 5 round mag, and considering the tight fit, that's okay with me. I noticed the verbiage on the package about modding the follower to allow for a 6 round capacity. After a couple minutes of work, it's a 6 round magazine. I'll definitely be buying some more, and some 10 round ones after they become available.