May 17th 2014 Umarex Colt Python .357 CO2 BB Air Gun - Double Gun - This is a review of the New Umarex Colt Python .357 CO2 powered metal BB air gun. In this episode I get to go double gun with a pair of pythons, and had a blast. Enjoy Giles ** Yes, I know, I said 2" and not 2.5"...........it was a hot day. This video contains a review of a pellet / BB rifle. Its powered entirely by spring actioned compressed air and uses no gunpowder and must not be confused with any form of tactical firearm. My Targets are paper and tins. Always shoot safely and show consideration to others around you, this review is designed entirely as an independent review.