Is a pistol really needed?

When I reach the level, I am going to get a SCAR-HEAVY...
But when I get my next money bonus after that I am not sure if I should buy a pistol?!

I have used the Deagle a few times and it's okay. But I don't seem to use it all that often. To be honest I never use it really, I only got it because it looks cool.

Is it worth me buying a pistol then?

Thanks

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