Recover Tactical MG45-01 Angled Mag Pouch Black Polymer for Glock 10mm Auto, 45 ACP Double Stack Magazines The MG45 Angled Mag Pouch for the 20/21 Stabilizer is only able to carry 10mm and 45ACP Glock Double Stack Magazines. It features locking push button for quick mounting, bullet in mag witness window and works with Picatinny rails.