MicroMag Cram'N'Jam Feed
Cram N Jam style feed designed to fit PTP MicroMag, not certain if this will fit all generations.
Requires two o-rings to retain your 10 round tube, just size some rings that that will snugly hold your tube in place.
Be careful with the retaining screw/screws! Make sure they don't stick too far into the breech where they can collide with the bolt.