Clamshell adapter to put PPS mags into a different magwell of a very popular and common lower.

Uses M3x19 (I just grind a bit off 20mm) threaded screws to hold it together. Do not overtighten, it's not needed.
v9 added pockets for M3 nuts.

Depending on what magazine/upper/boltcarrier/etc, you have to pick the height of the magazine in the adapter.
Filename Zplus0mm is the base height, z+0p5 9s 0.5mm, z+1mm and z+2mm raise the PPS magazine up inside the adapter by 1 and 2mm respectively. You want the PPS magazine to be just below the point where it's dragging on the bolt carrier.

created v10, left and right halves, of the v9 +0.5mm model. Bambu studio was trying to join the halves back together when slicing.