There's not much room in there for a holster, especially if you have a larger gun. Once it's tight against your chest, there is no real way for it to float around. If you have any amount of gear in the pockets, that also snugs up the gun. I've not had "floating" issues and I usually carry a 3" S&W 60. By default, the trigger is covered.
Last edited by CCH; 08/13/11.
