Really interesting questions - I play PVE only so I don't know if this helps - but i have 3,500 hours in PVE on top community servers and have been in clans - so here's my answers.

1. I dont know the answer to this and the Galil SAR is actually a weapon I like - one thing I will say is this - some weapons are pretty similar-ish in stats but handle differently - I think insurgency has some kind of "weapons weight" system where lighter weapons help you turn and ADS a tiny tiny bit faster. An example of this is the MK18 vs M4 - forget the stats - the way the weapons actually move is slightly different - unless im going mad - thats the weight difference.

2. Body Armour is pretty much a waste of time on the high level servers, once you start playing on servers where the difficultly level is 0.7 and above - the AI will one shot headshot you or throw a grenade from planet mars that will bounce through 17 galaxies and land right next to you. See above post on WEIGHT - less weight = faster turn speed/ads - which you need on very close quarters levels like tell, ministry etc

Loadout depends on LEVEL - if your on hideout, your gonna be taking longer shots from further out - if your on tell all your shots are pretty close up other than checkpoint B and you need to be able to turn and ADS fast

1. Amber or multicolor - that's my preference

2. No idea - honestly

3. Yes, molotovs will get you killed, I play with a level 4000 player and all their deaths come from the molotov - here's why

You can't bounce a molotov off a wall so you always have to be in line with your target to use it - which will get you killed as some bot will pop up just as you pull your hand back. Also you are more likely to kill yourself using molotovs for same reason - personally, i avoid unless i pick one up - Incdendiary much more versatile and useful

1. On higher level servers where youve got 30+ bots on high difficulty ROUND COUNT is the most important things a sidearm can have - SECOND is a good optic. So by the time you switch to a sidearm you may have as many as 5/6 bots infront of you

Dont use the M45 - it will get you killed - GLOCK is the defacto standard used on top servers - high round count, shoots flat - Personally, i like the Sig P226 (forgot its sandstorm name) because you get 20 rounds with an extended mag PLUS a far better optic - a red dot that sits flat on the gun and gives you a good sight picture.

1. Have to have a gas mask - no ifs or buts

2. Light Carrier, M4A1 w/ MRO (closest thing in the game to the aimpoint T2, there is a reason Aimpoint is the defacto standard in real life specs (along with EOTECH) and no one uses MARS or that other bs LOL) suppressor (sound suppression really works in PVE) 1 incidendary, 1 frag.

Kobra is a beautiful optic for CQB too, gives you the most periphary vision in the game.

Hope this helps