Designed to integrate directly into the T.rex Arms sidecar 2.0, the M.U.P.A is a magnetic bridge to carry any magazine or accessory that you want. It also has the added benefit of spreading the belt clips further apart to accommodate a belt buckle being worn at 12 o'clock. You no longer have to choose between a magazine or a Tourniquet attachment, carry both with the MUPA.
 
Yes, it will work with factory Glock magazines but will not work with fully polymer magazines such as Magpul's Glock mags. It will also work with any metal magazine or object for that matter.