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Old 03-12-2017, 07:03 PM
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Default Winchester model 75 target question.

There was a Model 75 thread awhile back, but I can't find it now.
Anywho....I have a question.
I have a Model 75 target and would like to mount a bipod, probably a Harris. But the gun has a rail that will not accept a Harris bipod as designed. I'm wondering whether there is an adapter or another method anyone knows of to mount the bipod. I don't want to drill a new hole in the stock and would prefer a way to use the rail to mount an adapter or similar device.
Here is a photo that I found on Google showing a M75 with a Harris bipod. I have no idea who owns this gun or else I would ask him.
Thanks.
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Old 03-12-2017, 07:27 PM
Camster Camster is offline
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Mount a sling swivel to your rail? or weld one to a sacrificial rail screw?

Last edited by Camster; 03-12-2017 at 07:28 PM.
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Old 03-12-2017, 07:30 PM
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An aluminum slide bar to fit your rail, and a sling swivel stud mounted in it. You can install it as needed. Look around, there should be something available. Make sure your rail is a standard rail.
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Old 03-12-2017, 07:35 PM
Ivan the Butcher Ivan the Butcher is offline
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Those rails on the target small bores were of a couple of types. One type by 2 or 3 makers, was a "T" groove the length of the forend. Champion Shooter's Supply in Utica, Ohio makes a small adaptor that fits the standard Winchester rail in one direction, and the standard Anschutz rail in the other. The cost is only a few dollars. Phone 1-800-821-4867 (closed Monday).

The other rail type was an inset bar with threaded holes that allowed a hand stop to be adjusted to your needs. If you have that type see if the threads are of any standard thread. Uncle Mike's and Brownelle's both sell machine thread- sling swivel studs. Just match up your own adapter.

I used the second method to make a bipod adapter for an AR-15 with a Key Lock forend, cost me about $1.80.

Champion may have a swivel stud adaptor that fits the threaded rails, you just have to ask. Most of the staff shot small bore competition over the last 50 to 60 years, so they have probably seen every factory made and home made idea you can put on a target 22!

Ivan
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Old 03-12-2017, 08:28 PM
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Quote:
Originally Posted by Ivan the Butcher View Post

The other rail type was an inset bar with threaded holes that allowed a hand stop to be adjusted to your needs. If you have that type see if the threads are of any standard thread. Uncle Mike's and Brownelle's both sell machine thread- sling swivel studs. Just match up your own adapter. used the second method to make a bipod adapter for an AR-15 with a Key Lock forend, cos
It me about $1.80.

Ivan
Ivan, My rail must be the second type. The rail is 1/2" wide and has six threaded holes positioned 1/2" apart. I have no idea what the thread pattern is. If I can find my thread chaser set, I will see if one of the screws that I have matches any of the thread patterns on the chasers.
Thanks.
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Old 03-12-2017, 10:11 PM
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Afraid I can't tell you what the thread in the sling bar is either even after checking mine because I was curious. It appears to be a proprietary thread as it doesn't match either anything either SAE or Metric. The bolt in mine measures .286" x ca. 30 TPI. It is between 28 and 32 TPI, my thread gauge is pretty standard. I expected it to be 1/4 x 28 TPI, but it isn't even close. My rifle is ca. 1959, no reason they would have used a metric thread at that time!

Sorry I couldn't help, thought this would be easy!
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Old 03-12-2017, 10:19 PM
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Afraid I can't tell you what the thread in the sling bar is either even after checking mine because I was curious. It appears to be a proprietary thread as it doesn't match either anything either SAE or Metric. The bolt in mine measures .286" x ca. 30 TPI. It is between 28 and 32 TPI, my thread gauge is pretty standard. I expected it to be 1/4 x 28 TPI, but it isn't even close. My rifle is ca. 1959, no reason they would have used a metric thread at that time!

Sorry I couldn't help, thought this would be easy!
I went down that road as well. I got anywhere between 27 and 32 TPI. I can't tell for sure with a thread chaser. I measured a major diameter of 0.285".
This is why it is not a simple case to just find the right swivel stud.
I could possibly fabricate an aluminum plate that will accept two of the Model 75's rail screws, with a drilled and tapped hole between them for a standard swivel stud. My facilities for fabrication are somewhat limited. No drill press, for example. So it could be a rough go.
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Old 03-12-2017, 10:22 PM
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Quote:
Originally Posted by Camster View Post
Mount a sling swivel to your rail? or weld one to a sacrificial rail screw?
Welding sounds like a reasonable way to go. I have a friend with welding equipment.
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Old 03-13-2017, 02:37 AM
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I have the same threaded rail on my Model 70 match rifle and it's in a marksman stock. The holes you mention are for locating a hand stop to which a sling was attached. On one of my model 70's I had an Anschutz aluminum rail fitted so as to allow more adjustment for the hand stop and sling position. The rail would most likely be bought from Creedmore sports and usually would be set up in a milling machine to cut the slot for the rail. Check with Creedmore and see what they have in stock. If not to your liking you most likely will need to install a sling swivel screw which I believe is all that you will need to have for use with a Harris bipod. Check with Creedmore and ask if they have an adaptor that will fit the rail that will allow use of a bipod. Or check with Haris as to what you will need for use with one of their bipods. Good luck and hope this was of some help. Frank
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Old 03-13-2017, 11:54 AM
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I counted the threads and arrived at 30 threads per inch, which gives a pitch of 0.03333".
One approach might be to take a screw that I already have for the rail, cut off the head, and then drill a cross hole and flat off the sides to give a shape equivalent to an actual sling swivel stud.
I'm not equipped to do a proper job of it, so I'd need to contact a machinist.
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Old 03-14-2017, 08:01 AM
Fkimble Fkimble is offline
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No need for any cutting or welding. Just get the adapter that fits in the rail with a sling stud sticking out. Most any of the big name shooting supply places will have them. Usually on the same page as the Harris bipods.

Frank
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Old 03-14-2017, 09:07 AM
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Quote:
Originally Posted by Fkimble View Post
No need for any cutting or welding. Just get the adapter that fits in the rail with a sling stud sticking out. Most any of the big name shooting supply places will have them. Usually on the same page as the Harris bipods.

Frank
Frank, I have been this route and did not find anything. I saw lots of adapters, but none that were for my rail.
If you know of a part number, that would be helpful.
Thanks.
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Old 03-16-2017, 07:34 PM
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Default Viola!

A few minutes with my friend at his home machine shop, and here we are:
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Old 03-16-2017, 09:23 PM
Ivan the Butcher Ivan the Butcher is offline
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There you go! So is the thread 1/4-30?

Ivan
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Old 03-16-2017, 09:33 PM
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Quote:
Originally Posted by Ivan the Butcher View Post
There you go! So is the thread 1/4-30?

Ivan
Ivan, All I know i that I counted 30 TPI and the major diameter measured close to 1/4". As far as whether it is 1/4 x 30, I can't say for sure. I see only one reference to 1/4 x 30, and it on a British website.
All I did was to modify an original M75 screw to make a Harris bipod adapter.
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