Oh no worries, just recently I started to look for bayo for my norc, otherwise I would not have known. M5 bayonet was designed for M1 Garand, M6 is for M14, m7 was designed for M16, M9 was designed for M4. They are ALL "M's" :D The last two are interchangeable and maybe I got them wrong, maybe m7 was designed for M4, not sure.