You must have the right amount of light to your eye so an adjustable aperture is number one.

You can improve your scores by selecting the right focus or balance of sharpness between your front sight and the target so I believe the adjustable diopter is essential.

Every time I have tested using the colour filters or the dual polarizer; I always got better scores using straight light to my eye, so I do not value these add ons.

These other addons make you believe you are seeing a better sight picture.
However the apparently improved sight picture did squat for improving my scores; rather they actually slightly decreased my scores after numerous trials.

Then the precision of adjustment of your sight is the next most important thing.

I strongly believe it is better to have 1/8 or 1/10 MOA adjustments so you can better select your point of aim.

With a scope you can hold off but with iron sights you need the fine accuracy of adjustment if you are going to have an edge in competition.

I do not think 1/4 MOA adjustments will shoot fine enough to win competitions because there are some pretty strong competitors out there.

I screwed one of those #530's into the tube sight I built and it definitely helped my iron sight scores.  Agree with Schützendaves's views on adjustment.  I got mine from Champions Choice - believe they are $140 now.

Regards, Joe

I mostly use Baldwin sights, or did when I could see well enough. Does anyone know about thread compatibility or adaptors between the two products?

Does anyone know about or use any of the sight discs offered by the Merit Corporation? They also offer a lens disc. Has anyone ever used one of these?

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Is it optically or scientifically possible to have a lens in the rear sight and one in the front sight so this combination functions just like a telescopic sight? 

As I recall, the thread on the Gehman is an oddball metric.  It's close to a US size - maybe 3/8 - 24 ?   In my own case, that's what I used and it acted somewhat like a pipe thread - turned in two or three threads and started to tighten up - worked fine for my application.  I had no luck trying to find out the thread sizes for their adaptor (577).

California fires have not affected us this far south Dave, but the devastation up north is hard to see.

We should probably start a new thread for tube sights so as not to derail this one.

Regards, Joe

The thread is 9.5 x 1 metric.

It is very close to a 3/8 x 24, will actually engage it about 3-4 threads before it binds.

Thanks for the thread info. Interesting possibilities. At the worst, more stuff for the heirs to wonder at and toss.

I like the idea of a clamp and that would save me having to cut that oddball inside thread for an adapter. Cutting the outside 10-40 to fit the MVA on my Ballard will be easy but I am getting way ahead of myself since I haven't shot the Cadet yet with the new sight disk and that will be the proof. 

I for one would be interested in a tube sight thread if someone wants to open one. That is another area that I would to know more about. Thanks, ratseye