ALG Defense's long-awaited 6 second mount is now available for $250.
Link: http://algdefense.com/6-second-mount.html
And luckily there are several holster makers accommodating this addition.
Off the Grid Concepts came up with ADR MKVI holster. This holster works for Glock 17, 34, and 17L and you can choose to have weapon mounted lights SureFire X300 series and X400 series. Price is $85
Link: https://otghex.com/products/mkvi/?navselect=group3
Advanced Holster from Fayetteville, NC is going to produce one soon
Link: http://www.advancedholster.com/default.html
From: ALG Defense, Off the Grid Concepts, Soldier Systems