1903 "counter sunk" muzzle?

[JBBOOKS]

What do you make of this? It is on a 1903 Springfield rifle.Attachment 110217Attachment 110216 What does the "M" stamp mean? Why was the muzzle crown "counter sunk"

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[browningautorifle]

Looks to have the remnants of a star beside it too...

[ArtPahl]

Isn't the star supposed to be below the bore? That's where it is on my NRA sporter.

[browningautorifle]

Yes, six o'clock position.

[jamie5070]

Counter sinking was typically done to a rifle with a damaged/worn crown but the rest of the barrel is good. My impression is that it was a civilian repair. I remember seeing some 1917's for sale with counter boring almost an inch deep

[browningautorifle]

Counter sinking

I agree this looks civilian done. Is this one actually counter bored or just a counter sink (AKA) crown?

[gjungle56]

Is that a replacement barrel? The muzzle looks very much like what is seen on replacement barrels like Sedgley and High Standard.

[Patrick Chadwick]

It looks like countersinking, not counterboring. The muzzle proobably had bad cord wear (i.e. one-sided abrasion) and the countersinking was done to even up the profile.

[browningautorifle]

It looks like countersinking

To me, I've seen better jobs too. To me it looks like a reamer of sorts applied with force, not a sharp chisel in a lathe.

[John Beard]

Please oblige us with a picture of the barrel markings behind the front sight. That may give us a clue to answer your question.

J.B.