No4 Mk1/3 Origination and bolt head track

[ArtioZen]

Greetings - I just rebuilt this rifle having found it as a sporter. The suncorite was nice throughout after its FTR. If this was a Savage No4Mk1* originally would the Fazakerley FTR have removed (machined off) the "US Property" mark off the receiver wall? No other clues remain per its Pre FTR identity.

It shoots very well - however after 45 rounds and during slow prone the bolt head was jumping off its rail (only while firing and being cycled, dry fire / cycling does not produce it).

There are now 2 small chips on the edges of the rail window in the receiver. I have to research the bolt head grove modifications that armorers used to help.

So how bad do you think the receiver rail chips are? Fettle the metal?
Should I relieve the bolt head grooves?
What do you think of any scrubbed "US Property" marks on this FTR?

Shot a personal best with her less 2 points overall - just needed a couple of MOA elevation..Attachment 100628Attachment 100627Attachment 100629Attachment 100630

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