I picked up the PIF >10 round .22 mags from scrid2000 yesterday and today I found out one of them is a 10 rounder.
It's an Advantage Arms XD conversion kit .22LR mag.
http://www.advantagearms.com/mm5/mercha ... Code=XDMagI don't know if it's the XD or XDM version or if it's the 9mm or 45 version, as I can't seem to find dims on their site and it looks like they use the exact same picture for each.
It's just over 3/4" wide, 1-1/4" deep, and just over 4-3/4" from top to base plate.
Again, this only holds 10 rounds.
If you can use it, let me know and I'll get it to you.