Model 23, Mark I (Rifle)
This grenade is nothing more than the No. 5 fitted with a rod 5¼ inches long screwed into a steel base plug which in turn screws into the bottom of the grenade. To keep the lever of the bomb in place after the pin has been pulled, a ring attachment is fixed to the rifle by means of the bayonet.
Lieutenant Colonel William E. Persons, Infantry Major Oliver S. Wood, Infantry Major Joseph Plassmeyer, Cavalry Captain Paul V. Kellogg and , Infantry First Lieutenant John E.McCammon Military Science and Tactics (, MO: The University Co-operative Store, 1922)