AEG BB misfeeding/misfiring - or cold weather issue

[-Shade]

Played a game the other day where the average temp was around freezing or below zero. Does cold weather cause issues for AEGs, not including the batteries?

Essentially what was happening to me was my gun wouldn't fire my .3 bioval BBs properly. They would misfeed. I would press the trigger 2-3 times, and the motor would cycle fully each time no problem, before a BB shot out. If I switched to .3 green devils or ANYTHING below .3, like my .28 and .25 - they would fire perfectly with no hassle.

Is it just always cold in the UK where green devils come from, so they know how to handle the weather? lol? Is it just the biovals?

I just fired every BB type I have inside my house INCLUDING the .3 biovals and everything works flawlessly.

I may have answered my own question here, but is it just the weather then? Can I help this in any way? Obviously the simple answer is just use green devils or lower weight BBs, but are there any other surprises I should watch out for with cold weather? (aside from batteries)

Thanks!

[Spike]

Regular hop up buckings don't get along well with cold. Since rubber shrinks when it's cold out, it can lead to all kinds of problems. Misfeeds, jams, horrible lack of range, etc.

[cetane]

Try another brand of 0.30's and/or different mags. Could just be the biovals and cold with your gun & mags. My old g&g cansoft m4 would feed anything with CA mids or stock hicap. Green labels & mag mags wouldn't feed any bio bbs (ka, madbull, bbb) but non bios just fine.

[Koolie]

Shade! Clear inbox space so I can reply PM once you have space. Ty

[ThunderCactus]

The problem is your hop rubber and POTENTIALLY the grease in your cylinder.
Silicone based grease is best for cold temps, but synthetic should be sufficient for down to -5
The harder your hop rubber is, the harder it will get in the cold. The harder it is, the less hop it will impart to the BB, and the more pressure you need to put on it to get hop. And that's where you get a lot of jamming.
You'll also notice the more frequently you shoot, the better it will feed. Whatever action of shooting, whether it's friction from the BB or the air compressing that warms up the rubber, something warms it up as you shoot.
You may notice it works fine when you dump half a mag quickly, then wait 5 minutes, try to one-shot a guy and it jams lol

So in the summer, we recommend harder rubbers for higher FPS. At 470 you want 70 degree, at 400 you want 50-60. Basically harder means more wear resistance, which IS important with standard hop rubbers.
In winter, you'll benefit from having a 50 degree (guarder clear) even at 400fps. It might get wrecked fast, but you'll get the performance you need.

Rhops are soft material, and flat hops in general are a superior design for winter use, and you can leave it in there year round. So Rhop is definitely a good way to go.

Another interesting issue in humid climates can be moisture inside the barrel. Mags get snow on them, BB's get wet, it's possible you can get moisture inside the barrel, and it'll make your shots go all wonky, but shouldn't cause any jamming.