Source: http://www.kyledefoor.com/2012/02/no-more-serpa-holsters-in-my-classes.html

"No more SERPA holsters in my classes

Instead of an outright ban, I have a solution. There are many military units that have been issued/chosen/been told they are using this absurdly dangerous holster. For you guys here is what I've got-

With the holster empty take a long sharp knife, reach down inside the SERPA and cut/saw the plastic piece that rests inside the trigger guard when the weapon is holstered. You may need to use a set of needle nose pliers to help rip that nub off. This will make the push button a non issue and the tension screw can be used for retention.

Whoever chose this piece of shit to be issued to anyone- you're an inexperienced pistol shooter who has no common sense. Hope you got a decent kickback from Blackhawk."

Je ne connais pas la réputation de ce monsieur mais je pense par contre que le fait que de plus en plus de personnes rapportent des experiences négatives sur ce type de holsters alarmant...