There are various micrometer rear peep sites that bolt onto this action (SMLE compatible) - usually bolting on in place of the safety spring and requiring slightly longer fasteners - be sure they are included or accounted for in the price. I prefer the Parker Hale PH5A - an online search will provide pictures and specifications - adds great control when in good order and a nice increase in sight radius. I really had to work on the quality and torque of the fasteners to hold zero with the small PH5 footprint and the recoil of a 308. It seems that some sellers are moving the sight bodies without eyepieces to get better prices - also watch / account for this. A full functioning PH5 with fasteners and decent eyepiece can be as much as the original asking pice of this rifle on the open market - shop around!
There are lots of other equivalent sights (some folding or quick detach) such as Central of Australiaicon. The battle sight v notch plate has to be removed (and saved) to allow the new rear sight to see past it.
A more economic way to go is the bolt on rear ring sight appeture plate to replace the vee notch in the stock rear sight position - perpetually listed on auction sites.

The front sight as a ring can be acheived through a tube sight with interchangeable elements. PH make various models - most will require attention to the dovetail mount (various ways forward) - I do not get into these as I prefer the blade front sight - Others may have specific guidance.

A while back I did see an SMLE nosecap with integral tube sight - not seperate parts welded together - it seemed purpose built - but unmarked. I have not seen one since - if anyone can shed any light. this may also get me into element tube sights!

One last check for your new rifle - check the integrety of the front hand guard - especially around the breech - the choice of wood and drying heat / service history can leave this very dry and brittle - clean, oil inside and out and refit if good. I have seen a couple of these rifles with a tell-tale gap between lower front arm and wrist - a possibility of internally crumbling wood rather than bad workmanship.

I hope this helps!
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