20 kills with an ACOG scope on your gun
If you're only going for headshots, (as if to get a certain camo), the thermal scope makes enemies easier to see.
yes
pure luck
The closest you can get to having an unscoped m21 is using an ACOG scope on it.
a hard scope is a scope of more than two seconds long before killing somebody
Line the enemy up in your crosshairs, and pull the scope up and shoot the second your scope zooms in.
u cant
Try an acog scope or if there is snow or dust flying around a thermal scope. Try to get the bling perk so that you can have a thermal scope AND fmj
Examples of thermal energy sources include the sun, geothermal energy from the Earth's core, and heat generated by burning fossil fuels such as coal, oil, and gas. Thermal energy is also produced by human-made systems like power plants and heat pumps.
You can get a thermal scope for most guns if not all. The first thing you need to do is get 100 kills with the weapon you want the thermal scope for, then you get the ACOG scope. Once you have the ACOG scope, you have to get 20 kills WHILE LOOKING THROUGH THE SCOPE. Then you will have a thermal scope and enjoy. In my own opinion, get it for a gun that has high range, and one that you would camp with like an LMG or a sniper rifle.
On the XBOX 360, yes.
yes! Its back just like it was in MW2.