Major Jackie Knockshot (b. Samuel Hamilton, 1960, West Kingston) was a famous intro man known for his wild lick shots (sound effects). He started making sound effects as a youth while going to school. The sounds he created would be taken from guns, shell and ammunition. But also inspired by Bammy Man he would initially humm bass lines and rhythms on dances.

Knockshot was also a comic book artist, writer - for the Canadian magazine Reggae Quarterly and an aspiring actor.

As an appreciated intro man Jackie would figure on several dubplates for Sound Systems such as King Jammy's, Rodigan and V-Rocket.

He would later in his career relocate to the states where he changed his artist name to either the High Plain Drifter or High Plane Drifter.