When mentioning about ridge around the inside of the bayonet handle, made me look at mine. There is no visible ring outside the handle but it looks like the ridge is inside handle. And if you look at Yopper's picture on reply 43 there is none showing also. Now I wonder if tula lengthen the handle to cover the ridge? Measured the length of my handle and it is 56.4 mm. diameter of bayonet at handle is 14.4 mm. I cannot measure ridge as it is inside handle and I will not remove bayonet from rifle since it has not been removed before.