CS:GO Private Matches

If my friend and I wanted to see who was better with the M4A1S in a 1v1, how could we 1v1 using only the M4A1S or some other guns (on Dust 2 or any map)?

What good are daggers?

I've gotten to Venice and I have never so much as drawn my dagger (well, not on purpose. Thanks, obnoxiously twitchy weapon selector!). I haven'...