lol I'm not saying gas is bad! It's just not the best first time gun. I'm actually thinking about picking up an ARES DSR-1.
Atmospheric pressures change how the gun reacts. Making it inconsistent, thats bad for sniping.
Take it from someone who has invested close to what people have spent in a lifetime on airsoft into researching and making the perfect gas gun, stay away from the DSR-1. Yeah, it is a neat looking gun.. But it stops there. If you get any kind of gas gun, and you don't plan on running HPA or Co2.. Don't waste your time. I could post fifty pages of statistical data and information but the final line is, just get someone to either build you a good rig or take the 10-20hrs to do it yourself and fine tune it. For the price of the ARES DSR-1, you could have a nice custom setup with air or co2 setup that hits out to 250+ft with little maintenance required. If you want some elaboration, shoot me a PM.