P90 (this gun I am the most interested in, from these 3, developed in 1990, currently in service) << https://en.wikipedia.org/wiki/FN_P90
(Winchester Model Model 1886)
Possibility to change zooming distance. (at least on sniper rifle)
Possibility to change the radio mode to Radio silence.
Possibility to change gun from the right hand to the left hand, because when you want to aim on your left side and you have gun in right hand the enemy see you much better because of the angle and area of your body which has to be uncovered to aim down on the enemy. This could help in close combat when you are hiding by the wall and then you want to suprise the enemy by looking around the corner from your left side.
Another aiming style to switch, in very close combat, for example with sniper rifle etc. with big scope lens(the one on long distance). For example: When I would go to some building with sniper rifle and enemy suprises me, the aiming through huge lens is really hard so there I could use the Another aming style. I hope that you can understand me - I am not native english speaker.
Shooting when you are sprinting - it should be very inaccurately but in the real life you can shoot while you are running.
Shooting when you are jumping, should be possible too and even by the while you are laying down on the ground but very inaccurate against the jumping one. - When I imagine that I aim on enemy from some wall and I fall down I should be able to kill him from the air.
The RPG and explosives should destroy or damage the shape of building.
People who get hit by bullet, for example to the leg, should fall down on ground and then crawl on the ground or jump on one leg or something like that. They sould not use the damaged leg.
I am not sure right now about the smoke but in the old insurgency when you were for example in the first floor and somebody threw the smoke to the ground floor, the smoke shoud't be visible in the first floor going through the floor and other things like these.
Some evasive motions like somersault, roll to avoid something. I think that the Rambo films contain these motions
In the game could be rope for climbing on roofs and high positions - just an idea.
30.9. - New idea - Truth about silencer - increases damage, reduces recoil.