A neighbour has found a rear sight (he shot smallbore competition for several decades) that he doesn't recognise as something he used himself.
To me, it appears military, but scaled down - my guess is a .22 rimfire training rifle perhaps.
It doesn't appear to have any means of attachment so I'm guessing it's designed to be soldered in place.
- 20191205_175035b.jpg (258.69 KiB) Viewed 10672 times
Barrel diameter is about .650", which again points to a .22" bore.
I was thinking maybe an aftermarket "military-style" sight, except that it is serial numbered with "1232".
- 20191205_174949b.jpg (276.61 KiB) Viewed 10672 times
Graduations are not notched or "clicks", just friction, so recoil is negligible.
Measuring the graduations gives me the following:
At the "50" setting the bottom of the notch is .298" above the barrel diameter
The "100" setting is plus .089".
The "200" is plus .171".
The "300" is plus .288".
The "400" is plus .470".
The 500" is plus .709".
The top setting (no distance marking but looks to be in line with "600" based on the scale) is plus 1.007".
It also has a windage mark .090" either side of the centre of the notch.
A sight radius of 500mm would make the sight settings roughly 15.5MoA, 30MoA, 50.5MoA, 82MoA, 124MoA, and 190MoA, and the windage marks 15.5 minutes.
This is pretty close to .22LR trajectory out to 600yds, if the 500mm sight radius is a good guess.
Does it look vaguely familiar to anybody?