In the following video you'll see why we like the Safariland 7TS material and ALS locking system. It is a really tough material that is essentially impervious to the elements.  Here I try to put a lifetime of hard use into a few minutes. 

Forgive the video quality- one day when I decide to be a famous instagramer I'll get a high speed camera setup. Or not.

Safariland 7TS Holster Review and Torture Test

Here are some photos of the holsters used.  I fixed the cracked light holster with a wood-burner. It did end up breaking at the melted seem again and finally got retired. 

The Glock 19 without light holster suffered nothing more than scratches.