ElectroPneumatic operation for ultra smooth cycling
Completely CO2 compatable thanks to the Max Flo R Vertical Reg
BOB design makes it easy to maintain, only needs the bolt to be lubed and cleaned, and you're done
Low Force Bolt chops NO paint, even without eyes
and the list continues SMART PARTS
SP1 hands down once again.
Howevre I encourage you to look into a spyder VS2 or even a promaster as well. There's also plenty other used markers for the same price