How do GBBR perform in Oregon?

[Viper [TFW-W07]]

anything under around 55 degrees will not perform the best and under 40 degrees it sucks.. especialy if youu leave the gun sit att 40 degrees for 2 hours then use it, what part of oregon airsoft you moving to? im from bend

[Switchback]

I know I already posted in this thread, but I just got a WE M4. First impressions on gas efficiency are very good. I'm getting 2-2.5 magazines (before ROF tails off a little) off of an almost empty propane tank, and able to fire bursts close together.
I will be running FastMags mounted on top of M14 pouches packed with handwarmers as the weather gets cooler.