2 x chromed metal stip springs which lie vertically inside the V71 provide the retention. They are quite abrasive to the HA111 but will not cause too much damage to the underlying Aluminum. However, if you use the V71 you will end up with a 'marked' light, and there is no way around it except by use of a nylon pouch or pocket carry! My experiences of a V71 are that it provides secure carry and quick deployment for those that need it, i.e, military, LEO's security etc. For the rest of us a nylon pouch is a better bet. Just MHO your mileage may vary?
Doug