I noticed when I tried a new belt that the Fobus GL2 paddle holster will trip the mag release of a G19 with certain combinations of belt and waistband material. I cut a relief in my GL2 to clear the release button. My G19 is Gen 2.
ADDED: my GL2 is an old one, with just the rivets. From the 90s. I've used it a lot, with no problems.
ADDED: my GL2 is an old one, with just the rivets. From the 90s. I've used it a lot, with no problems.