Shotgun formation.Shotgun combines elements of the short punt and spread formations — "spread" in that it has receivers spread widely instead of close to or behind the interior line players. The origins of the term are thought to be that it is like a "shotgun" in spraying receivers around the field. Shotgun formation - Wikipedia Was this helpful? Shotgun | Offense | Offensive Formations May 17, 2013Found exclusively in the Chiefs’ playbook, this 3×1 Shotgun formation places three receivers lined up on the right side, while one receiver lines up on left side. The halfback lines up to the left of the quarterback, hence the HB Wk in the formation’s title. The WR1 lines up to the left and the WR2 lines up to the right. Chip Kelly Playbook 101: Shotgun Formation, the Inside The shotgun formation compliments the running game in Kelly’s offense. The foundational play of his offense is the inside-zone run. The inside-zone running game is as old as football itself.