Slackening off the Main Screw |
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Posted: October 22 2018 at 8:19am |
I'm curious if anyone (besides me) loosens off the main screw after shooting their rifles. I used to do this every time, for fear that the constant tension would warp the forend. Then one day I shot my No. 4 and had not tightened the screw. Fortunately, no damage, it only took me a few rounds to realize the screw was not tight.
The No. 4 that I regularly shoot has had the main screw tight for about a year now. The other rifles that I don't shoot often have the main screws loosened off. |
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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I do not. My reasoning being that the collar will limit the ability to crush overly.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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Just my two cents worth here. The forestock has factory bedding points for the barrel and the receiver correct? The factory then added two handguards that are clamped and screwed together around the forestock with a total of three clamping points including the king screw. My thinking would be to leave everything tight against each other. Loosening the king screw after shooting allows for the wood which has been warmed from shooting to cool down and tighten around the receiver more then what was intended. When you tighten the screw back up before shooting the receiver then cuts into the factory inlettings,stressing the wood at those points. The rifle was not designed to have the king screw loosened after it has been shot. From a machinist perspective, constantly tightening and loosening of the same screw will eventually wear the screw threads down along with the internal threads on the receiver enough to not let the screw to lock into the king boss as intended. Again,just my two cents worth.
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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All good comments.
Two of my No. 4 rifles have a composition barrel bearing support in the forend (the barrel does not contact at the muzzle or the handguards). The 7.62 has a bearing at the middle band, the .303 is "center bedded", the bearing is roughly centered between the mid band and the receiver. The barrel is free floating forward of the bearing. I don't think either have a collar on the main screw. |
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Online Points: 5586 |
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I also have a Fulton's regulated No4 Mk1/2 rifle. It does have the collar on the main screw.
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It's nice to be important, but it's more important to be nice!
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Hummmmm, I'll have to check tonight on this. It might be retained in the wood.
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