Chief Clifford says they can't question the suspect until he has counsel; however, there was no indication that the suspect had requested counsel. If a suspect has been read his Miranda rights and does not invoke his right to counsel, the police are free to question him and would certainly do so.
When the assassin Green Hat fires one barrel of his shotgun at McCloud, it sounds like he's firing a rifle. When McCloud fires back and Green Hat, in falling, fires the second barrel, it's a normal shotgun sound.