New 2 Me 1917 Artillary All Numbers Match?

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All Numbers Match but thier is no # on the Mmagazine base, Toggle Link pin or the grips, is this normal?
The # on the firing pin has one didget lower than the other It is a 20 that looks like this: 2
0

See below pec.

Also as I will be using it as a shooter Should the firing pin have groves ground into it or be replaced with one with the three groves?

Ed Reimbold