yes
yes! Its back just like it was in MW2.
It all depends on how you play. If you hard scope, it is probably the Barrett 50 cal, however if you quick scope and drag scope it is the Intervention. if u do both its the WA2000 but its kinda nooby...
20 kills with an ACOG scope on your gun
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
Put your target in the middle of you (laid at ease) Intervention's crosshairs, pull the aim trigger, either just before or just after you scope in for about 1/3 of a second you fired like "trigger" 1/3 second (letting scope come up) "fire".
yes it has more accuracy than it is in mw2
On the XBOX 360, yes.
Quick scope