It is my understanding that teeth on the 18 are cut to be straight
up and down and other knifes at an angle.Read that somewhere or was told to me.Can be verified by disclaimed by Scott,Capt etc.Have quiet a few with saw teeth including a couple of 5's
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Billy Poyner
RKCC CM 021 RKS 5030
NRA Endowment

Proud to have served my country 67-69