OrangeTJ

There are tons of red dot options, but I can recommend the Vortex Crossfire. I have them on airsoft and real guns and they work great. If they can stand up to many hudreds of rounds of what my 12 gauge shooting slugs dishes out, I feel certain that they could last 100 years of continuous shooting on the MWS. There is no lighting situation in which they can't operate and present a good dot. reasonable price relative to the quality.

Honestly, since I started playing with gas blowback, I've had precisely zero interest in AEGs. My first was a GHK G5, then a G&G SMC9, and now the MWS. The other two are fun and I suspect the GHK would run even coated in mud, but the MWS is a dramatically finer piece of equipment than either of the other two. The only place where the "performance" lags an AEG in my opinion, is in the ability to just pull the trigger hundreds of times without swapping mags. All that results in is wasting bbs, really. The overall feel and experience of playing GBB makes the AEG pale in comparison and the MWS is about as good as it gets in GBBs. Had I known then what I know now, I would have just gotten the MWS in the first place and save myself quite a lot of money. I don't know about truly cold weather but I've played in temps down to about 45F (not cold, I know) with no issues at all. Frankly as a Californian I'm spoiled to warmer weather and really wouldn't want to play in freezing temps anyway, as I haven't found a good way to keep my goggles from fogging at those lower temps.

Tough call, then. I definitely wouldn't want one that might mess up my muscle memory for use on the real one. Does the KWA operate properly? I know it is off scale, too, but most of what I've read about them has been positive and KWA is typically very good with parts support if anything breaks.

I have a GHK G5, which has performed flawlessly over about 7500 rounds fired and despite having been dropped in the mud, bled upon, playing in the cold rain and blazing heat, and being fed only Coleman propane (I do clean and maintain it - but it has never failed me in adverse game conditions) Highly recommend. I recently acquired a TM MWS, which is much "nicer" in pretty much every way. If you don't want to spend a ton, though, the G5 is a great option and very fun to play with. It is also extremely light, which is nice over the course of a long day at the field!

Why do you want a longer inner barrel? What are you trying to achieve?

In my limited experience, plastic TM pistols are substantialy better than metal pistols from other manufacturers. I understand the appeal of metal (I've thought about changing the slide on my HK45 for a metal one), but I can't help but recognize that the engineering in the rest of the gun was designed as a system. Changing out parts negates the engineering work that went into it and is just as likely to harm performance as help it. I guess my perspective is different because I'm in the USA, but if I were just a "collector", I would just spend my money on the real thing (and have, multiple times). Nothing in airsoft can actually compare. Outside of skirmishing, there's no real point for me in having airsoft guns so I struggle with the "collector" approach. However, skirmishing with airsoft guns is truthfully a lot more fun than target shooting or plinking with real ones. The flip side is that target shooting or plinking with real ones is much more fun than doing the same with airsoft guns. Again, my perspective is likely highly skewed by the fact that I'm in the USA.

Do you shoot a real one?

I haven't been able to find the M4 mags but have purchased 4 Type 89 mags, which work perfectly. Evike.com has them. Don't know if they ship to where you are but worth a look.