Sure, just try them and see?
[Leeched]CheatEngine Adresses
Doesnt work for me 

Everything works for me, thanks for this. Would have been perfect if there were addresses for all classes including league... Does anyone know how I can find them myself?
Thanks a lot 
Edit: um I read the tutorial but I knew that simple stuff already... what I don't get is how people find addresses for classes themselves, along with killstreaks, camo's and so on... They don't really have an obvious value to search for and then change and filter....

Edit: um I read the tutorial but I knew that simple stuff already... what I don't get is how people find addresses for classes themselves, along with killstreaks, camo's and so on... They don't really have an obvious value to search for and then change and filter....
@mykybo long barrel and silencer together dont crash the game?
It does, you can put together only things that the game allows you normally - you cant have 2 scopes or things like that. But you can have 2 primaries, or rocket launcher instead of primary, etc.. You can just try it.. it wont get you banned (I didnt get, but use on your own risk) 

Some addresses are real trial and error and 1000 crashes,
when I found the laser in MW3 for weapons ammo type and weapon to be able to change weapon in single player, moments after I changed another value and crashed out so had to find the laser all over again.
General addresses are easy to find ammo, nades, xp etc as you do something and change it to the known value in CE, health you know the start point so get hurt and search for decreased amount, then revive and search for higher value. log in and out of game several times to narrow the search down
Most other things are done through Debuggers like olly with dvars or trial and crash
when I found the laser in MW3 for weapons ammo type and weapon to be able to change weapon in single player, moments after I changed another value and crashed out so had to find the laser all over again.
General addresses are easy to find ammo, nades, xp etc as you do something and change it to the known value in CE, health you know the start point so get hurt and search for decreased amount, then revive and search for higher value. log in and out of game several times to narrow the search down
Most other things are done through Debuggers like olly with dvars or trial and crash
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(at least for mw3)