How Can I Fix Vertical Stringing?

Improving and repairing firearms. Rifle bedding, barrel work, stock replacement and other ways to improve your firearms.

Re: How Can I Fix Vertical Stringing?

Post by Wm.Traynor » 19 Nov 2018, 9:04 pm

2018-11-19 16.41.28.jpg
2018-11-19 16.41.28.jpg (1.31 MiB) Viewed 159 times
This is that pesky screw. At the flat, smooth-turned, tip you can make out a "bevel". I wonder if this has been formed/deformed by colliding with the forward edge of the hole? Well, that's my theory................for now ;)
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Re: How Can I Fix Vertical Stringing?

Post by Wm.Traynor » 19 Nov 2018, 9:13 pm

2018-11-19 16.40.51.jpg
A slightly better view of the "bevel", which is at six o'clock on the flat tip.
2018-11-19 16.40.51.jpg (1.47 MiB) Viewed 159 times
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Re: How Can I Fix Vertical Stringing?

Post by Wm.Traynor » 19 Nov 2018, 9:25 pm

The question now remains as to what to do to stop the tube sliding forward. I'll have to think about that but a screw of the right length comes to mind. I wonder if this is a stock screw or a bodgey one and what would they send me if I ordered a new one?
Oh dear, I think I'm starting to lose my marbles :? :crazy:
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Re: How Can I Fix Vertical Stringing?

Post by marksman » 20 Nov 2018, 6:28 pm

I think your approach is very logical
IMHO I do not think this is your problem causing the vertical stringing but I would want the rifle to be solid as you do
it actually sounds to me like the temper of the barrel is not good causing the barrel to warp as it heats up :unknown:
I would try shoot a group very slowly giving a big amount of time between shots to shoot from a cold barrel each shot and see if the vertical is still there
good luck with it anyway :thumbsup:
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Re: How Can I Fix Vertical Stringing?

Post by Wm.Traynor » 20 Nov 2018, 7:15 pm

Thanks for your reply marksman :thumbsup:
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Re: How Can I Fix Vertical Stringing?

Post by Wm.Traynor » 20 Nov 2018, 7:39 pm

At this point, I have only questions. For instance, "What is the proper function of the Magazine Cap Screw?" We know that it holds the cap secure in the tube but the length of unthreaded, turned-down section could have two functions, namely 1) to stop the tube sliding and 2) to apply pressure to the underside of the barrel, as a means of "tuning" the vertical spread. My MCS performs neither function because contact is haphazard, random and unreliable.

And then there is marksman's point about a warping barrel but to test that idea the tube has to stop creeping. Did I mention that the tube can be moved backwards and forwards when the front barrel band (FBB )is tightened firmly? There are cut-outs in the bottom of the barrel and top of the tube for the screw but this fastener does not make enough contact with the mag tube to prevent movement. I am thinking of packing the bottom of the lower half of the band which will raise the whole tube. This will make the MCS fit inside the blind barrel hole. That way both the MCS and the FBB will prevent sliding...............I hope ;)
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