Achieve the ACR Mastery Challenge.
Get to rank 70
You have to buy the emblem for 1000 CP (cod points). Once you've bought it you have to Press. "X" (PS3) and I think "A" (X Box) Button nearest to bottom.
ACR means Adaptive Combat Rifle.
The SCAR is stronger than the ACR.
You unlock guns by reaching the level required to unlock that gun, but if you want to use it in your custom class, you have to buy it using COD points.
you unlock that when you have unlocked every attachment and every camo for every gun in mw2
Mw3: Mp7 Silenced or Acr 6.8 Black Ops: Famas dual Mag Mw2:Acr, Model 1887, Anything with a grenade launcher Rangers Akimbo Famas, UMP, WA2000 and the last sniper (cant remember the name) CoD 5: Mp40 Round Drum CoD 4: Mp5 M16 Grenade Launcher, AK-74u.
yes, there is a trench gun on cod 5
Yes it is, very accurate
Yes there is but if you are looking for it it may be more commonly known as the Bushmaster Magpul ACR Adaptive Combat Rifle.
There is no gun called that.
No