During the 60’s and 70’s Trainboynia was in the midst of a very bureaucratic struggle, the 100 mm versus the 105 mm, with designers vetoing the m68 for about 20 years, before it was adopted on the R-54 in 1978 and fully implemented in 1982 because the designers were adamant about designing a domestic 105mm or a upgraded 100mm or the failure that was the 115mm gun, while the R-51 R-53 and R-60 M60 proved that the 105mm was worth it