Here's a quick run down of what I did while I have the time.
After I got the short 10 round S&W M&P 15-22 mag, I stripped it down, cut the floor plate tabs off with a hand saw. Then I removed more material at the depth of the adapter plate, so the mag would insert flush to the drum.
Next I welded .125" x .5" SS strap material perpendicular to the A&D plate to secure both sides of the mag. Then I filled the hollow voids in the bottom of the mag with JB weld for a solid area to use tension pins. I finished by drilling through the side plates and mag to insert the pins.
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