Waven

Most of not all made in Taiwan BBs uses BLS to produce BBs anyway(tho maybe they have different spec and tolerance) I mostly use GBBR and occasionally AEG I'll say G&G was the best I ever used(I used 0.28 in the past, good enough even for bolt action rifles) , but now I tried 0.25 from ASG devil, valken, delta, BLS, never had a single issue nor unstable trajectory.

MWS system GBBR + pistol(barely needed to be drawn), 2 bottle of ASG green gas can get me through three 3-4 hrs cqb sessions But my habit is mostly just single tap, I almost never finish 3 magazines in one 15-30min session I believe that design has a reason. Some say thecdesign is to ensure there are some space for the liquid gas to expand, and I think it make sense. Since a magazine only holds 35 rounds there is not much point to put more gas in.

Barrel is AEG spec yes And when using original TM outer barrel with AEG handguard an adaptor is needed too. Some other brands MWS made their outer barrel ring bigger so adaptor is not needed, but not the original tm

I don't think you need any extra bits but I'd avoid 5ku OB, since the barrel is only fixed to the chamber by two grub screws. Spend like £10 extra to get a one-piece or threaded one would feels better

Even the savia mag is lighter than tm stock, and it has high flow valve. However my savia one need some filing on the follower before it can do bolt lock after empty. The other thing is I loved the mirror finish of TM mag so much lol

Reducing mag type I need is one reason I get one. Yes I still carry same amount of mag(6), but if the PCC is dead I have all 6 mags ready for pistol

I suppose 'doesn't cover airsoft' only valid when your glass is broken by a bb? Otherwise I don't think there is any way they will know if your scope is on an airsoft or a range firearm?

There is a easy but not good looking way to fix if it is just the base- Thread tape on it. It doesn't work that well for mag base hold by pins(works better on base fixed by a long screw, like WE glock mags or hicapa mags),but it still holds for a long time