[Kos-Mos]

I have first hand experience with a WE SCAR Open bolt in -20C weather.
Yeah, same gun you have.

VN-style 20-rnd, removed the end spring spacer to bump to 24rnd.
It was at an indoor venue, in Valley-Field, so wind was not a factor. Cold only.

Propane mag, topped-off and then heated to body temperature (that means that there was actually MORE propane in the mag than usual) COULD NOT empty 24rnd. Barely shot 10 before spraying ice in the rifle body.

That is because the ambient air around the mag is used to heat the magazine in normal conditions. It took half the mag for it to become freezing cold and ice to form on the shell.

Tested with CO2 mag also. That was a bit better. Weaker kick than usual but the gun fired all the rounds properly. The cartridge was frozen in place in the magazine shell.

Both tests where on SEMI, 2 rnds per second, in 5 rounds "bursts", spaced 5 seconds each.

I have not tested MAPP yet, but will probably this winter.

I have also shattered a nozzle on the second run of the CO2 mag, and could not double the test.

As for semi/full,
I played this week-end. Most of the time SEMI.
But please, explain to me how you would have engaged 7 players at 50' when they saw you and turned to shoot?
I flipped the switch to AUTO and burst. Got 4 of them before I was hit.