"Hey, what is that little round thing on the back of the holster?"
We get asked this a LOT, so let's talk about it! That little round thing is just a simple rubber puck that we mount on the back of our IWB weapon light indexing holsters to aid in comfort as well as concealment similar to a foam wedge that you might find on other IWB holsters. We use the rubber puck because it won't break down or wear out and need to be replaced periodically like a foam wedge. It is also very minimal and easy to install or remove unlike the various methods that are used to attach a foam wedge to the back of a holster (i.e. velcro, molding tape, glue, etc.).
1 - Comfort
Since it's made of rubber and is round and smooth, it reduces any potential hot spots that you might get from the holster if it wasn't there. When wearing the holster, it also gives you the perception that the holster is only as long as where the puck is mounted to the holster (i.e. the length of a Glock 19 size gun without a light) which dramatically improves your comfort level. Let's face it, wearing a holster in the appendix position that accommodates a handgun with a fullsize weapon mounted light is not an endeavor in comfort, but we have found that the rubber puck helps to increase the comfort level.
2 - Concealment
In addition to the comfort aspect, the rubber puck also pushes the bottom of the holster away from your body, which tilts the back of the gun into your body just a little bit. Combined with the concealment fin (AKA "wing" or "claw"), it substantially reduces printing when carrying concealed.
There is nothing special or proprietary about this rubber puck. In fact, it can be purchased at most local hardware stores as it is not specific to holsters. We gave this thing a try several years ago after we made our first fullsize weapon mounted light holster in an effort to increase the comfort level, and we've found no reason to change to something else as it works very well. If you'd rather not use it or you prefer to install a foam wedge, then the puck is easily removed from the holster with just one screw.
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