How To: Mod a Kriss Magazine Extension for Glock 20 (Video)
Pretty simple project, and a fun way to blow through expensive 10mm ammo even faster. I got the original instructions from this post. Though that guy says he fit 33 rounds, the most I can manage with the Glock factory speed loader is 32, though there seems to be room left in the mag. I think cutting down the spring could fit a few extra rounds but I don't want to risk any potential feeding issues.