You should mostly think about semi-automatic. Other than that, you probably want to know what GBBR works best in cold weather. Here are some that I heard are pretty good, resisting the winter months.

GHK PDW

WE PDW

GHK G5

We G39

KJW M4

I'm waiting for Tokyo Marui M4 GBBR :D

Oh Sh#t forgot about that one. Well it can probably withstand colder temperatures. If you look at the TM MP7 the cool down is almost non existent. I don't know whats up with Polymer Gbb these days but they seem to hold up to colder climates.

Will try this tmrw for you with a GHK M4 and let you know :)

WE.

Having had a second gen WETTI/AWSS M4A1, I gamed the bitch HARD for about 6 years, no real maintenance beyond a re-lube and wipe down after games. Damn thing ran STRONG!

I got rid of it due to funding issues, but if I were to go GBBR again, and I am seriously considering it, it would be WE WITHOUT QUESTION.

Gen 1 mags were beyond unreliable, but the Gen 2 are pretty good.

Does anyone have are really good review on the GHK M4? I keep hearing the mags are no longer compatible, cool down times are terrible and parts compatibility an issue and to stay away from it as well.

I have an old WE sticking kicking although part do break but easy to change out.

Or should I give KJW a try.

One thing on my list is a review on the M4, currently its not a well known gun and too many are bashing something they havent even seen haha

I did do a quick little test on mine, its been in my truck in nasty negative temperatures for 3 days, gassed and loaded. Brought it into the range and fired it right away with no issues whatso ever.

Every one i have sold has had rave reviews. I may ask those guys to quickly drop in here and give us some pros/cons on the guns.

If you have any immediate questions id be happy to help.

-James

Was the magazines fired at negative temps or just the M4?

mags were gassed and loaded before being left in the truck for the 3 days, fired right after i brought them onto the range :)

-James

give a KJ works a try, i have one and it is amazing, the last game i played, i counted 7 rifles that was KJ works including mines
one thing broke on it, and its the hop up lever, but i am able to land my shots on target in 20 meters, tested in semi and full auto, only had 20 meters to work with, for i was doing it in my backyard
however, to order new parts is easy and painless, so i have been lead to believe
and there is a huge thread on the KJ works m4 by baker_jeff
greatest asset is that it can use AEG parts, with minor modding to work, the receiver thread is spec'd to TM and WA, milspec and AEG collapsing stocks fits on the buffer tube
the newer STANAG magazines has the weight of a fully load real steel magazines

KWA

I have been running 2 stock MP7's for 2 years never had an issue

Is the hop up easy to adjust? How is efficiency?

Stock, it has a click wheel to adjust the hop-up. However many prople go for a TDC mod instead where a set-screw pushes on the hop-up arm. It gives much better adjustements. Other just mod the hop-up arm so you have a bit more pressure on the bucking. While the KJ is very hard to break for a GBBR the hop-up is certainly the weakest part. However I dont know yet a "perfect" GBBR platform.

I like the GHK ak over the WE ak. Because of 3 reasons.

1- GHK mags hold 50 bbs instead of WEs 32 bbs.
2- Rof is much faster on a GHK.
3- External steel and paint is much better quality.

# 4 lol- Mag gas efficiency is much better and the mags function well in the cold :)

Just my opinion.

GHK M4

I got my GHK M4 from Raven Wolf.

Awesome to deal with.

Thanks James !