I use a glock 26 serpa holster for all my TM glocks(g18c, g18c with pgc metal slide, g26, g17) and have no problem with it being tight. The glock 17/19 serpa is way too tight for the pistols. If you still have a problem with the g26 serpa take out the little plastic piece. That may help because the screw that holds that in sometimes makes the holster to tight. hope that helps