Bead Sight Threads Protrude into Barrel??

[Lawyer]

The brass bead sight on my mossberg blew off last weekend at the range, and I replaced it with a tru-dot bead sight.

I tried my best to sand down the extra threads, but it protrudes slightly into the barrel (only the very smooth end of the screw). I do remember the factory bead sight also protruded slightly into the barrel.

Is this going to be unsafe?


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[Tom-ADC]

I wouldn't worry about it use a little lock tite on it not the perm stuff and shoot it.

[Lawyer]

Bead Sight Threads Protrude into Barrel??

I wouldn't worry about it use a little lock tite on it not the perm stuff and shoot it.

That's what I did. I had removed the original and put it back on without loctite, and poof!


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[wweigle]

I suspect that the Mossberg site that blew off was caused by it protruding into the barrel. I had a new Mossberg that I noticed the the site protruding slightly into the barrel and sure enough it came out after some shooting. Mossberg has in the past been real sloppy in this area of quality control. I think you will need to make sure your new site is flush with the barrel or you may have the same problem. Consider getting some emery cloth and a wooden dowel or other round shaped object and sanding the site down flush so nothing protrudes into the barrel. Just go easy and make sure you do not take any material off the barrel. Good Luck!!

[edgerly779]

It will disrupt the flow of shot and disturb the pattern density . Needs to be flush. Don't listen to tom adc. If it is a tactical shotgun with 18" barrel then don't worry. If you hunt with it you need the best performance possible.

[Lawyer]

It will disrupt the flow of shot and disturb the pattern density . Needs to be flush. Don't listen to tom adc. If it is a tactical shotgun with 18" barrel then don't worry. If you hunt with it you need the best performance possible.

Just use it for home defense & at the indoor range.


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[aBrowningfan]

Just use it for home defense & at the indoor range.

Try a pattern test (with and without the sight protruding into the barrel). I suspect you will see a different pattern with the sight protruding into the barrel. How much of a difference, IDK.

[Lawyer]

Try a pattern test (with and without the sight protruding into the barrel). I suspect you will see a different pattern with the sight protruding into the barrel. How much of a difference, IDK.

Will do. My main concern was safety.


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[bigbearbear]

I'm not an expert armorer myself but I think the protruding thread might act like a choke and constricts the wad/shot a little, depending on how much extra length is there. The main safety issue would be that the sight itself might be ejected from the barrel with some force and hit someone.

If you can, I think it might not be a bad idea to cut/sand it down so that it sits flush or even a little inside the barrel itself.

[Tom-ADC]

I read his 1st post as its something he can barely feel, I'd bet if you measured it it does protrude more then a couple of thousands into the barrel, its not a skeet or trap gun even something he hunts with. Much ado over nothing IMHO.

[riftol]

The brass bead sight on my mossberg blew off last weekend at the range, and I replaced it with a tru-dot bead sight.

I tried my best to sand down the extra threads, but it protrudes slightly into the barrel (only the very smooth end of the screw). I do remember the factory bead sight also protruded slightly into the barrel.

Is this going to be unsafe?


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If the protrusion is only a few thousandths of an inch, and just enough to be felt, I wouldn't worry about it.

One of my 12-gauge shotguns had a slight burr at the bottom of the muzzle's counterbore that is tapped for chokes.

~ 90 degrees of the counterbore's shoulder was burred. I worried that this amount of burr, though thin, could snag the wad and possibly raise pressure. I was also concerned that if I used a machinist's scraper to remove the burr I might scratch the barrel's bore just below the counterbore's shoulder. I decided I'd shoot the new gun with light loads. That I did and nothing out of the ordinary occurred. Eventually the burr was eliminated; since lead shot is harder than the wad my conjecture is that the shot removed the burr.

[Lawyer]

It's difficult to photograph, but I will try to add some pictures.


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[bigbearbear]

It's difficult to photograph, but I will try to add some pictures.


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SAFETY FIRST!! Clear shotgun before trying.

You will need to shine a flash light into the barrel so that your camera's autofocus can lock and focus on the inside of the barrel.

[Lawyer]

Bead Sight Threads Protrude into Barrel??

The pictures might be deceptive, but I have to say, the protrusion is very slight. However, you can feel a very smooth nub with your finger.




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[border.bandito]

that (IMO) is enough to explain why the first sight 'blew off'....lol

i say cut or sand down the exposed part....and save yourself from having to buy another sight since #2 also 'blew off'....