Weapon level 5
You unlock Claymore at Level 53 in MW3! :-)
You unlock the ACR 68 at level 56. Hope this helped! :)
The Striker is unlocked at level 48 in Multiplayer and level 33 in Spec Ops.
You level up your secondary that you want attachments on.
most likely mw3 will have guns and attachments that you will unlock from level to level.you probably will not see and point system to buy attatchments for guns
find the custom class and unlock them
The guns themselves can gain experience, and the more you use them, the more they get. When they level up, you unlock attachments, proficiencies, and skins for them.
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 :/
Level 69
Yes, you can i did it in the last level of mw3
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.
Using MW3 Prestige Rank Hack for free by getting it from the Modern Warfare Prestige Hack site and using it to edit and hack your Prestige Level, Rank and unlock everything from guns, camouflage and attachments. Source http://www.mw3prestigehack.net/