Okay so there this glitch thats getting out that you can duplicate c4's. First you pull the c4 out in your hand then you look and you can see your ammo is 0/1 then put the c4 back into your inventory then pull it back out again and your ammo will be 0/2 and you will be able to use it without loosing the c4. I do have to admit I have used this glitch a little but for the most part I have been buying c4's. I think this needs a patch and I am willing to accept a punishment for using this exploit as T mod.
The person who has been showing people this glitch is stoic and I have used it I will take responsibility for that.