Diana D75 sight saga

Jump to latest Follow Reply
J

jccams

Member
May 4, 2021
856
1,183
Michigan, United States
I have a very nice D75S T01 mfg 91 lefty that is very healthy and accurate. I bought it with a centra Duo front sight and a nice Gehmann rear sight setup. Problem is front sight is 11mm, dovetail is 9mm. I was able to resolve with a 1mm pin. Today I realized the rear sight is a 13mm dovetail, obviously not centered on an 11mm dovetail, although secure. Not sure the seller ever shot it with these sights. So I had purchased a T01 rear sight as the seller couldn't find the original. Since I have the OEM front sight I decided to put the T01 on it, so I could at least shoot it. Nope the sight won't slide on the dovetail. What am I missing, T01 gun, T01 marked sight. Frustrating having such a nice gun that I can't shoot. Any advice welcome. Looks like I'll be selling these nice sights.

Update: As a longshot I contacted the seller to see if he could find the original rear sight. He replied that he had found it and is going to send it to me. Be interesting to see what it is.
 
Last edited:
  • Like
Reactions: r1lover, Paul Be Careful, maxtrouble and 3 others
marflow 777 said:
show me the front sight
the same front sight would have been used on the Model 65-66 and 100
you say it will not fit because it is too tight or too small
Click to expand...
This is the rear sight that won't fit. The seller is sending the original sight. I'll post pictures of the sight that won't fit.
Here's the OEM front sight with a Gehmann adjustable iris. It looks like it takes a metal insert, I have the insert retainer for the sight. What would I look for for inserts?
IMG_2603 (1).jpg

Here is the dovetail on the gun and the sight I cannot get to slide on.

IMG_2605.jpg
IMG_2606.jpg
IMG_2607.jpg
 
Last edited:
  • Like
Reactions: Bandito and maxtrouble
Upvote 0
so, the diopter is correct and the rifle and the sight should just slide together
start it at the front of the mount it is easier and if the front of the sight is damaged from use it will start where it is not
they are a tight fit
i cannot see if the diopter rails have been damaged over time, it does show a lot of use
 
  • Like
Reactions: Bandito
Upvote 0
Motorhead said:
Odd ... My 75 HV ( Which did come with 2 front sight assemblies ) are cast as a one piece unit, tho do take screw in inserts etc .
Whats odd is I can't recall seeing a front hood sight that dovetail mounts as your showing on original D75's ?

Pics are the "High" and low looks identical just lower :giggle:

View attachment 498216

View attachment 498218
Click to expand...
Scroll down the page and you will see pics of the same set up as his rifle.
 
  • Like
Reactions: Bandito and Motorhead
Upvote 0
Chuck-in-Ohio said:
You did loosen the clamping foot on the sight before trying to install it correct?
Click to expand...
Can't even get it to start sliding on.
marflow 777 said:
so, the diopter is correct and the rifle and the sight should just slide together
start it at the front of the mount it is easier and if the front of the sight is damaged from use it will start where it is not
they are a tight fit
i cannot see if the diopter rails have been damaged over time, it does show a lot of use
Click to expand...
Didn't realize it was such a tight fit, I'll try again.
 
  • Like
Reactions: Bandito
Upvote 0
zrman27500 said:
I was just thinking that those hv rifles had a special riser block for the rear sight, I wonder if the dovetail is slightly different on a hv rifle to accommodate the riser block? Or possibly your dovetail or the sights dovetail has a burr on it or something.....the sight does look a little beat up on the bottom.
Click to expand...
Having an HV and having worked on many others over the years, the rear base dovetail is the same on all from what I've seen. There is a Riser plate that fits base for the HV application having rear sight on a taller plane.
The front on the ( My ) HV is a complete housing replacement where you just change over the guts of the sighting parts between Low and HV height housings.

DSCF0789.JPG
 
  • Like
Reactions: Bandito
Upvote 0
Motorhead said:
Having an HV and having worked on many others over the years, the rear base dovetail is the same on all from what I've seen. There is a Riser plate that fits base for the HV application having rear sight on a taller plane.
The front on the ( My ) HV is a complete housing replacement where you just change over the guts of the sighting parts between Low and HV height housings.

View attachment 498731
Click to expand...
Well that answers that question!🤣 I just wasn't sure if that was a possibility considering he can't get the correct t01 sight to fit on there.....it's gotta have a burr in the rail of the rifle, or the sight not allowing it so slide on. I can't think of anything else it would be.
 
Upvote 0
Update: I received the original rear sight today. This gun is a 91 mfg, the sight is a model 100 and it slid right on. Not sure the T01 sight is compatible. I have a T01 riser and the T01 sight slid right on that. Anyway I am a happy camper now that the gun is back to original. I am guessing at some point later in the production Diana switched to the 100 sight. The gun is marked T01. I saw a 92 mfg that also had the 100 sight on it.
thumbnail - 2024-09-26T162033.357.jpeg
thumbnail - 2024-09-26T162046.344.jpeg
 
  • Like
Reactions: fishing43
Upvote 0
Thanks for chiming in Mike, your knowledge and insight is always appreciated. This weekend I'll get the gun out and compare the T01 to the 100 sight. I'll also try and slide the T01 riser on the dovetail, at least I'll be able to see what's going on. The T01 sight doesn't allow you to see why it is not going on. I'll take some pictures of the rail too. I'm actually happy with the 100 sight, I think I can install a Gehmann adjustable iris. Can't wait to shoot it with its original sights.
 
Last edited:
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu