After the sword came the gun. This remained Thailand's preferred method of dispatch until it was replaced by lethal injection (*). Unlike Colorado where several gunmen are hired for the sport (recruited from local hunters), Thailand's marksman was a loner and a pro. The prisoner was tied with his back to the gunner. A piece of tarp with a strategically placed bull's-eye target was placed between the gunner and his prey. The gun was set to whip out half a dozen rapid shots. The last of the photos shows the actual gun that was used.
If you continue to travel this site you'll find some B/W photos of a thououghly shot prisoner.
(*) See THOCBDC's earlier discussion of this technique in connection with the execution of America's #1 bomber.