An Anzac Day No.4

Undecided what forum to put this qn in so the magazine will do.Any jokers familiar with NRA type shooting with a knowledge about range rifles.Ive got a tidy '43 Long Branch that must have a back story to it.SOS marked.Std 2 groove bbl lapped bore to mirror shine.I,d rate the bore condition as 11/10 if that is possible?The std 2 stage has been worked to now a single stage with a useful 4 lb ish let off.Had a battle flip on it when I got it.So I,m assuming it's been set up for range work ,maybe in a different configuration earlier.The interesting distinguishing feature is two painted yellow disks 20mm in diameter.1st on right side of lower hand guard.2nd on left side of rear of butt stock.Ive since removed it as per photos.Would anyone know what these paint disks denote - I presume for i.d. on the range re scrutineeringAttachment 248712?cheersAttachment 248715

Greetings,
The flip sight was likely replaced with a Parker Hale target sight for range shooting but this does not require any alteration so can easily be changed back.
GPM.

Yes I know that,which is in not so many words what I've already said.My question is what are the yellow marks?cheers

I would assume that it would be identification in the rack both in storage and on the range. The position of the spot on the butt stock would be visible even in a second tier of rifles and the fore wood one on the range. My old M38 has a disc on the butt stock in the same position for easy reference in storage.
GPM.

That trigger being modified to single stage caught my attention. No.4s are a true 2-stage trigger where the first pressure takes away most of the sear engagement before the second stage lets it go. Make sure that thing is not on the ragged edge- give it some hard and fast slam cocks to make sure the pin won't drop. Unloaded of course .. :)