MIL-G-14451B, MILITARY SPECIFICATION: GUN, SUBCALIBER, .30: M9 (17 APR 1973) [NO S/S DOCUMENT]

MIL-G-14451B, MILITARY SPECIFICATION: GUN, SUBCALIBER, .30: M9 (17 APR 1973) [NO S/S DOCUMENT]., This specification covers a subcaliber gun designed for insertion into the bore of the 105mm Recoilless Rifle M27A1 and the Cannons, 106mm Recoilless Rifle: M206 and M206A1 to enable the use of smaller caliber ammunition for training purposes