I've tried to search for an answer to this, and hate to say that I haven't been able to find. it!

If I am using Hypersonic option 2, and have four successful attacks, the damage dealt is 4. If on my fifth attempt, a critical miss is rolled, that is an unsuccessful attack, so the damage value of four from the last successful attack would be used I think.

Is that true, or would the damage dealt be reduced to 3 or something else? Thanks in advance for any help I can get!

The damage dealt would be four and...

You would take a click for the Crit Miss on roll #5.

Oh yeah, I didn't ask that exactly right did I? But I understand and appreciate the help!