The Shocktech Back Drop (Drop #0). Our latest Drop, machined to the perfect size to allow all the players that prefer .45 size N2 tank to maintain a proper shooting position afforded by a larger air system. Standard heavy duty dove tail mount lets most bottom lines bolt right up. No more turning our Drop #1 backwards, or have to hold the back of your gun against those nice - just-got-my-braces-off-teeth. Shocktech, One Name. Lots and Lots of Drops.