I guess my first thought is: Why carry a G26 if you're gonna use 2X extensions? The 26 is made for concealment but, IMO, you defeat the intent by adding that grip length. I'd get some GAP floorplates and use the 10rd mags.
Or just carry a G19 or other larger pistol.
-- Robert --
NRA Life Member
"Giving Money and Power to Government is Like Giving Whiskey and Car Keys to Teenage Boys" - PJ O'Rourke