They work pretty well; very minimal, aren't they? I had one 25 years ago, and did get my Walther to fall out, after running and jumping a bit (I was deliberately testing the tension and security of the holster). I did not like that. As long as you are aware that locking your upper arm over it to keep your gun from being jarred while running, jumping, etc, and you will not torque the gun out as easily by accident. Just make sure the spring is still strong enough to hold your gun in properly, but otherwise, it is a well made rig, and even interesting to collectors, as it is a unique design.