I have a Mossberg shotgun that needs the front sling stud installed. I’m looking online for instructions, but can’t seem to find any. I have the sling stud but it still rotates a bunch. I’ve found that there’s a washer that I assume goes under it? Looking for some collective Mossberg shotgun wisdom.

What type of stock is it?
Synthetic or wood?

If you post a picture of the stock that might help.

It’s synthetic, but the front sling attaches to a bayonet lug. I should have clarified, it’s a 590A1.

Without a picture or at least a link to the exact mount you have I’m not sure you’ll get useful help unless someone else has had the same issue you mention.

Being curious I tried to find what your setup might be, but Internet images of 590A1 shotguns seem to show different sling attachment types and none I could find provide closeups.

One thing to be aware of, though, is that it’s not uncommon for sling attachments on “tactical” type long guns to permit a degree of rotation to make it easier to use the sling in different carry positions. Although I don’t know anything about your setup, it’s possible that some rotation is intentional as part of its design.

I have a mossberg maverick and the front sling attachment point is a pin protruding from the magazine cap. Mine swivels, but is captured on the inside by a washer with teeth. I’d have to break it to remove it.

Sorry guys I'm having trouble posting pics. Apparently, the images I took are not supported by Flickr? Any advice on posting pics wopuld be appreciated.

I host mine on postimages dot org, it provides a thumbnail code you can copy for posting here.

If you email me the pictures I will post them for you.

Email address in my profile: Run everything together (i.e., no spaces) and substitute @ for "at" and a period (.) for "dot."

The photos:

So are you trying to put a new, non rotating stud where the current rotating stud is? I don't think that I have any way to make that happen beyond getting a new attachment point clamped to the barrel. I agree that, in my experience with a Mossberg 500, that this sling attachment point is integral and would not be able to be removed and replaced with a non-rotating head in it's original point.

I got the shotgun used but, per the owner it only had a side saddle and a collapsible stock installed. From what I’ve seen, some of the new ones don’t have the stud installed. I bought the sling stud from the Mossberg website. They also have the washer for sale as well. I just want to make sure that it is used with the model 590A1 and that it’s not just supposed to rotate.

From your description and the photos, I assume that you have this stud, but rather than tightening like a regular screw it keeps rotating, correct—?

https://www.mossberg.com/590a1...rkerized-12030p.html

You mentioned a washer, and again I assume you mean this one:
https://www.mossberg.com/quick...ud-washer-12146.html
The washer, however, is evidently intended to allow the stud to be “timed” properly with respect to the sling. How it would do that I don’t understand unless it’s some sort of crush fit.

So at this point I’m confused about what’s going on. I would think that if the pictured stud were used, it should be possible to tighten it down so it wouldn’t rotate. That might leave it at an improper angle, but evidently the washer is intended to fix that issue.

What am I missing?

Added: This is what Microsoft Copilot says about the washer's purpose, which I believe answers the question:

"The Mossberg sling swivel stud washer can help align the sling properly. Here's how:

"Orientation: The washer helps ensure that the sling swivel stud is oriented correctly, preventing it from rotating or shifting out of place.
"Alignment: By securing the stud firmly, the washer helps maintain the proper alignment of the sling, ensuring it hangs evenly and comfortably.
"Adjustment: In some cases, additional washers or gaskets can be used to fine-tune the alignment, especially if the initial setup isn't perfect."

But maybe someone else with the same model shotgun can answer the question definitively.

Great. I just wanted to verify that the washer was actually needed and not that the thread of my bayonet lug wasn’t off or damaged. I’ll have to order the washer and install it. Thanks Sigfruend.

You're welcome. I learned something myself.

Out of curiosity I tried to research that washer some, and I couldn’t find a lot of detailed information. What I did find all seems to indicate that it permits indexing the stud at the proper angle for the sling. How that is accomplished, though, is another question. I found one description that said it was made of aluminum. If true, perhaps by tightening the stud so that it actually deforms the aluminum that’s what allows the stud to be turned past the normal tightening limit of steel on steel, plus that would probably keep the stud pretty well fixed in one position.

If you get the washer, I’d be interested in how it turns out for you.

I ordered the washer and some extra parts for other projects. I hope some kind of instruction manual is included. I will provide an update when I have all the parts.

I have that 590A1; that does not look like the factory stud. Mine wasn’t glossy like that. The factory one did not rotate, either. It just threaded in from what I recall, with a lock washer. I’m on travel at the moment, or I’d verify this.

Despite its weight, I love that tank of a shotgun.