I was just looking at my HyScore 820SM which is without front/rear sights. I had purchased a set of RWS sights (so advertised) but the receiver sight won't fit my rail. It is just too narrow. Groove is 11mm at the base and 10mm at the top. It is marked T01 on the top and 2104 DRM with a capital R cast into the bottom. The front is a globe with inserts and looks to fit a standard dovetail.

First, what the heck rear sight DO I have? I guess it is RWS, but for what?
Second, why does MY gun take? I see that it was made 04 78, if that helps. Also, I have the barrel sleeve but not the sight base. Understand that is a big ouch.

Any help ou can give me will be appreciated. Gun seems to shoot fine and I will scope it if all else fails. Really nice grained walnut with the black mock vents.

RedFeather

The Hyscore 820 is a mod. 75, and you have the late model T01 sights. The 75 T01 was a later revision.

Got your message on the yellow board, as well. So, what will the T01 sight fit? I haven't any use for it at present. Won't fit a standard rimfire although the seller said the previous owner was shooting it on a Super Match (Anschutz 54?).

Mark, shouldn't the late sight fit the early gun with no problem? I have a "flat-bottom" Diopter 75 on an old model 60. It's the EARLY sight that won't fit the LATE rail.

(Guys, please forgive the redundance with the other posts...this is a copy of my yellow-forum post from this morning.)

It sounds to me as if the problem is, you have an EARLY sight, and a LATE gun--not the other way around.

The early Diopter 75 sight has "drooping" sides, i.e. they go below the line of the actual dovetail. As Marc mentioned, these are for early model 75's, which have what I call a "curved step" mounting rail (i.e. the sides of the rail below the dovetail itself, are curved to match the receiver contour). Diana's earlier Diopter 60 sight was made the same way. You might want to hang on to this sight, as it should fit the models 60, 65, and 66 barrel-cocking match rifles, as well as the older models 35 and 50 sporters.

The late Diopter 75 sight has no "droop." It is flat below the dovetail, to fit the 75 T01 which had a "flat step" mounting rail (the rail has a horizontal shoulder below the dovetail).

This late sight should fit ALL model 75's, regardless of dovetail configuration. I have one of these sights, that at various times I have had mounted on my models 35, 50, and 60. In fact it is a "universal" fit for any Diana with a "step" dovetail as far as I know.

To sum up: the early Diopter 75 fits only early guns, but the late Diopter 75 should fit anything.

Here is another solution: Anschutz rear sights work perfectly on the Diana dovetail. And in my opinion, they are better-quality sights--much sturdier and with finer adjustments--and are also rather easier to find on Ebay, at gunshows, etc. They also fit Walther, Anschutz, and Weihrauch with the post-1980 11 mm dovetail, BTW.

To illustrate the point, the model 60's in this shot both have the "curved step" rail. The standard gun has a Diopter 60 sight with "drooped" sides. The Tyro has a LATE Diopter 75 with flat bottom and no "droop."

You're right. Fridays cobwebs ! many of us have been through this. Doesn't the late Mod. 66 sight work on the early Mod. 75 as well ?

Poor me! Horizontal? The eraly fits the later but the later is early??!!??? Let's just go with the sight. I have the top one in your photo, on the Tyrolean. I guess that means I have the early gun. The sight will not slip on, as it's too tight. So, if I have the "universal" sight, I need the older model, which is hard to come by? How about the muzzle weight/base? Are they about impossible to find? If so, can a mod be fitted/dovetailed?

RedFeather

This would clear things up a bit.

Where are you located ? I may have that sight, I'll have to check. Tom Strayhorn, and Jim Edmondson tend to rat hole these things as well ! ;^)

Just got my Canon digital up and running yesterday but still need to load the software and download cradle.

I'm in Fairfax, Virginia. Pretty sure that my sight is the new one, as it looks like the top sight in the picture above. Still will need the front sight base. I can always file the rear's base and fabricate a front mount if it comes to that. I'm not in any great hurry.

Only the cut of the rail is different. As I said you need to be specific. ;^) There were also a Mod. 82,84, and Mod. 100 sight available for the Mod. 75 !

I will try to get the pix up asap. One the sight, itself, I believe the rear can be made to work. It's only aluminum, but the looks of it, so I should be able to file away. It's the fron sight base that I think will be hard to replace, as I can't see many of these going off by themselves. Maybe I'm wrong.

Redfeather, I hate to throw fuel on the fire, but I'm pretty sure you have an EARLY sight, and a LATE ("T 01") action. The LATE sight should fit ANY Diana target rifle, either old or new.

I would hesitate to change or modify this sight in any way, as it is quite a rare bit of kit. If you can't find the correct sight email me "off forum," I may be able to help you out.

Again, unless you are a stickler for absolute historical authenticity, find an Anschutz sight...they are better-quality and fit easily.

I just purchased a model 75 T01 and it arrived with the wrong sigts, Beeman sporter. I found your message while searching for a source of sights. I would be interested in purchasing the sights if they do not work for you. Let me know off list. Thanks!