“...and if the convict survives until the end he is set free.”
I’m ok with use of a firing squad for execution. But, historically, the problem has been with the shooters. Out of the twelve or so shooters, whether intentionally or not, often only a few would hit the target leaving the target
A slow death. So, I think some sound vetting needs to take place when selecting the firing squad members.
Seems the sensible way would be just two shooters at short range with M-16 rifles.