A favour from members who are lucky enough to own a trials rifle with its original rear sight.....
I'm after the details of the spring and plunger (dimensional details ideally)
Many Thanks
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A favour from members who are lucky enough to own a trials rifle with its original rear sight.....
I'm after the details of the spring and plunger (dimensional details ideally)
Many Thanks
Do you just have a ladder that you are looking to make up into a fully working sight?
Yes
After quite a few years of searching I've got a ladder on its way
Me too, from the States?
---------- Post added at 07:59 PM ---------- Previous post was at 07:59 PM ----------
I will be doing the same as you
There's no plunger, it's only a ball bearing and if you measure the hole with a vernier or plug gauge you'll find out what size is required. I'm afraid I don't recall except that it is possibly a few thou larger than the major diameter of the shank on the later plungers. The ball bearing idea wasn't a great one as the small contact area no doubt soon led to deformation of the hole and looseness in the sights.
A plain cylindrical plunger made up with a half round end would be another option if the hole is too badly worn at the top to hold the sight consistently enough for shooting - if one wanted to shoot such a rifle.
Indeed
Coming home, as the rifle its going on did
Are they so different from the No 4?Quote:
Originally Posted by waco16
Very differentQuote:
Originally Posted by browningautorifle
Trials rifle rear sights had circular cutouts for a ball detent for the raised and lowered positions
Std production No4 sights had flats that rested on the familiar spring loaded 'top hat'
No matter how I looked I couldn't find detail on them... The standard sights I have...Quote:
Originally Posted by waco16
I'll try to get ahold of a micrometer this week and take mine apart.
Here's a scan of a print from the film camera days that shows the difference. The rifle on the left is the trials Model C, of which 56(?) were made if I remember correctly. Notice that the cut made to accommodate the larger and later standard plunger is "in the white". The slightly odd residual "lip" at the top of the bolt way on the right side is thus explained!
And here is a crop of a Model C trials No.4 being shot at a range in the UK. The dowels inserted near the forend crossplate were a civilian modification. Notice the sling swivel on the guard. The forend cross plate is also differently arranged than the standard No.4.
Ball size: use a set of drill bits to find one that fits the hole or fitted to the notch in the bottom of the sight. That will give you a diameter.
There ya go :-
https://www.milsurps.com/images/impo...standard-1.jpg
Thanks MkV11, but that's the std production No4 plunger
The trials sights had circular cut-outs rather than flats for the plunger:
These blueprints (and for once they really are blueprints) are undated but a minute sheet in the file, of May 1932, lists a number of design modifications to be discussed including " .... new type spring & plunger for screw, backsight - plunger in place of ball. Detail 28, 47, 70 [appears to be the dwg numbers]. CISA proposal. Local agreement clear. " So they must have changed it quite early on - or is that just the clicking adjustment?
Interesting as the Model C I had was dated 1935. Slow process I suppose.