QUOTE (Paisley Pirate @ Mar 9 2006, 01:48 PM)
Depends on the gun and the cycle rate.
Generally, tho, if you are using green gas, by about 40F you probably would want to be looking at red gas.
Same thing with R134A if you use it, consider green gas by around 40-50F, and red gas at about 20 or so.
Again, this is not hard and fast. If you like to snap off 4 or 5 shots quickly, you may start experiencing freeze up by 50 or even 60F... it is dependant on the gun, too.
The larger (heavier) the mag, the longer for the heat to bleed out of it, and so the longer before it starts having temperature issues.
Hope that helps.
(I see a possible article for me to write.... I'll have to experiment on some guns...)
Everything Paisly said is basically correct. All of this will be covered in my pisoleer article (If I ever get a chance to continue writing it) I would like to stress though, that the numbers Paisly Pirate quoted are VERY loose.... and VERY dependant on what brand and model gun you have.
Also, in my experience... HFC 134A gas loses its punch well before 50 degrees F, even in guns designed for it (Any gbb made in Japan) And you will probably want to change to green gas before then. And with the execption of a few GBBs recently on the market that are actually designed for it... you should never use Red Gas unless its lower than 40 degrees out.\
Basically... heres the break down for GBBs and Ambient temp.
Japanese GBBs Or any gun with a plastic slide (Which are designed for HFC 134A)
60/70F+ : Use HFC 134A
40/50F thru 60/70F : Use Green Gas
Less than 40F : Use Red Gas
Most Taiwanese, Korean, Chinese made GBBs (With metal slides)
50F+ : Use Green Gas
Less than 50F : Use Red Gas
Select WE HiCappa models are designed for Red Gas at much warmer temps, but you should only use Green Gas if its really warm... just to be safe.
Regardless of what brand or model gun you have... ALWAYS make sure you keep your gun clean, dust free and properly lubricated with a silicone based lubricant between each usage. (Properly lubricated, not excessively coated with lubricant... over lubrication can be worse than no lube)
Also, the colder it gets, the slower you need to fire... as with each shot you are lowering the temperature of your magazine.... if you shoot too fast or too much.... your mag valve will freeze and crack. This is why you should NEVER use a select fire GBB in full auto mode in cool or cold weather.
NBBs are entirely different... and I don't know enough about them to give you advice in gas usage.