"Colored guns" or gun camos (short for camouflages) are unlocked through normal weapon use - by getting kills or destroying enemy support and equipment.
You unlock Claymore at Level 53 in MW3! :-)
you get to unlock any one thing including guns, special grenades, claymores and attachment etc. (note i have herd that if you unlock a gun and get it gold it resets to lv 1 after you prestige again)
What you have to do is level up till you can buy it or find cheats online but i have already cheacked for you could not find any :/
You can have both attachments on if you unlock the gun perk that lets you have two. ie, kick, focus, attachments
find the custom class and unlock them
The best mw3 gun is the L118A but that's because I like sniping.Or if you put the first one on perk 2 its the best quickscoping gun
The clan is rhvg
of course i have unlocked every gun but once u prestige u loose the guns and have to do everything all over again but u keep your titles emblems and some challenges
As Special Ops in MW3 has it's own ranking system you may unlock call signs in there however, they will not transfer over to the actual online lay as the criteria to unlock them is different.
you can only do it if you bought the hardened edition.
You unlock the ACR 68 at level 56. Hope this helped! :)
In MW3 you level up your gun by using it. You get xp by getting kills or destroying enemy equipment like a helicopter. If you use it enough you will unlock new attachments camouflages and other things.