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In multiplayer, a huge problem for me is how easy it is to run right by a claymore. You will trip it, but it will do practically nothing, and in core, it wont even kill someone standing directly in front of it sometimes. This can be fixed very easily. To do this, aall you need is 2 classes: 1 class with one man army (1st perk, reffered to as OMA) and a claymore, and another class with OMA and c4.
Basically, you go to the place where you want to plant your claymore in a good spot. facing an entrance horizontally, facing a bombsite, almost anywhere. Now, use OMA to switch to your c4 class. if your claymore is next to a choke point, where the enemy could trigger the claymore, then back up avoiding the blast, place the c4 in the middle of the corridor. The claymore will trigger the c4, killing people in the corridor. you could also put c4 directly on top of the claymore, so when the claymore explodes, it will have a circular blast zone.
*You can only have 2 claymores or 2 c4s... any more and the 1st one you placed will blow up.
Also, for unlimited smoke grenades, put smoke on an OMA class, and use it. throw a smoke, switch to the same class, and repeat. unlimited smoke screen.