Back in the day when time was young and so was I, I did some cold weather (Alaska, Arctic, etc.) testing for Cav-Arms where all this kind of started (not counting Colt's early attempts).
I stored it in a snowbank, swung it against trees, used it in a carbine class at -20 F, ran it over with a truck, used it as a step between tree branches, etc. That thing was indestructible.
This current product is far superior even to that.
Up until recently I owned prototype 6. I traded it to sinistral rifleman for one of the new ones. While I might have gotten more for it otherwise I wanted it to go to a good home who would appreciate. Due to his involvement along the way I thought he was the ideal candidate to adopt and love prototype 6.
tsh77769
Just to clarify that would be prototype # 6 of the original Cav Arms version.