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 Post subject: 590a1 mag cap.
PostPosted: Sat Jan 14, 2012 12:18 am 
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i was out shooting my new moss 590a1 (51411), and this is my first shotgun that i have ever bought. while i was loading it up my first time i noticed that i could put another round in after i already had 5 in the mag. i thought that this model was just a 5 plus 1 in the chamber. i am sure this is just something that can happen but i wasn't sure.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Jan 14, 2012 1:42 am 
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Location: It is the tradition that a Kentuckian never runs. He does not have to. (1931)
Hull lengths before crimping are standardized at 2.75" but the crimped lengths can vary. You were probably target shooting with birdshot, sir? Those may be a mite shorter in crimped length than your 00 buckshot HD load. Your 18.5" #51411 will hold 5 x 2.75" typical shells, but the compressed spring might only be 0.5" too long for the tube to hold one more shell, as you have done. 5 x 0.1" = 0.5", so if you have 5 really short crimped shells, a sixth shell could fit in also. The important thing will be how many 00 buckshot shells will fit. You can fit 5 Federal 2,75" 00 buckshot shells or 6 Hornady TAP blue hulls in your magazine tube. Eventually you will probably be shopping for a +1 magazine extension. I am unaware of any of the current manufacturers that are producing +2 extensions for 18.5" 590A1's that do not extend past the muzzle, but I sure would like to know of any that do not. Say, I really like your parkerized, bead sight #51411 model. Welcome to the Basement, johnst46.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Jan 14, 2012 2:11 am 
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yea i was shooting target loads Winchester game shot. thnks for thts info now i knw why this happened. i also have heard of two shot extensions but they were not true two shot extensions...


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 Post subject: 590a1 mag cap.
PostPosted: Sat Jan 14, 2012 4:12 pm 
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That's what I love about running Hornady TAP buckshot in my shotguns. I can always fit one more round than I can with other off the shelf buckshot.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Jan 14, 2012 7:15 pm 
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Joined: Fri Oct 21, 2011 5:31 pm
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Out of the box I could fit 6 2.75" Federal buck in my 18.5'" 590A1 tube,now that I have upgraded to a EP Wolfe spring this is no longer the case.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Mon Jan 16, 2012 4:33 pm 
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wfb18 wrote:
I am unaware of any of the current manufacturers that are producing +2 extensions for 18.5" 590A1's that do not extend past the muzzle, but I sure would like to know of any that do not.johnst46.


S&J Hardware is making one right now that fits flush with the end of the barrel:

http://sjhardware.com/store/modules.php ... cts_id=342


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 Post subject: Re: 590a1 mag cap.
PostPosted: Tue Jan 17, 2012 1:55 am 
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Thank you, steel. That's what I need for my 835 with 18.5" security barrel. Plus it is on sale. :wink:

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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu Jan 19, 2012 10:56 pm 
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Joined: Wed Jun 03, 2009 8:30 am
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A possible down side to loading 6 rounds into the tube is shorter spring life if you store the gun like that. Even spring steel will fatigue over time when stretched or compressed beyond it's "comfortable range". Chevy figured this out in the late 60's when they stopped putting coil springs on the rear axles of pickups.

If you store with 6 rounds in the tube you're keeping the spring compressed more than 2 in shorter than it would be with 5 rounds. Over time that has to take a toll.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Wed Jan 25, 2012 2:19 pm 
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wfb18 wrote:
Thank you, steel. That's what I need for my 835 with 18.5" security barrel. Plus it is on sale. :wink:


See viewtopic.php?f=7&t=257972&p=2405150#p2405150 for $99 deal apparently still good.

Thinking about one for my #51517. Have found four: Choate for around $50, Nordic for $75, S & J $100 and Vang $75.

S&J with free shipping seems like the sweet spot balancing cost and value. Conspicuous absence though of images of shotgun with extension attached. If you get one, a picture of it would be appreciated.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Mon Feb 13, 2012 7:39 pm 
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Finally took delivery of S&J Hardware Plus 2 Mag Tube Extension for my Mossberg 590A1 LE 51517. Just as advertised, tube measures flush with the 51517 barrel and parkerized finish exact to 590A1 (looks factory). Quite a transformation in appearance. Quality isn't cheap, though.
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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu Feb 23, 2012 6:54 pm 
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That's a beauty. :D S&J Hardware is at the absolute top as far as quality goes. I'd like to get a full sized 20" 590A1 and add the S&J +1 extension to it, for a dedicated 9+1 gun. I just exchanged emails with Simon Beeson at S&J and he said this would work just fine. It might be a bit long, but heck, 10 rounds without having to reload is pretty hard to beat.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu Feb 23, 2012 7:52 pm 
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steel wrote:
I'd like to get a full sized 20" 590A1 and add the S&J +1 extension to it, for a dedicated 9+1 gun. I just exchanged emails with Simon Beeson at S&J and he said this would work just fine. It might be a bit long ...


Took two weeks to get it (from Canada) but it was worth the wait. Decided that this +2 extension, relative to its competition, was the best overall value.

I'd think twice though about buying even a +1 for a 51663. Mag is already flush with barrel and images of extensions beyond their barrels show it just doesn't look right, not to mention the possibility of bending it inadvertently. Why not just buy a 5 or 6 round shell Buttstock Cuff?

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 Post subject: Re: Re: 590a1 mag cap.
PostPosted: Thu Feb 23, 2012 7:59 pm 
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steel wrote:
That's a beauty. :D S&J Hardware is at the absolute top as far as quality goes.

Yup, I understand their followers are impervious to paint thinner too.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu Feb 23, 2012 9:46 pm 
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Joined: Tue Jun 21, 2005 7:43 pm
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Klaatu wrote:
I'd think twice though about buying even a +1 for a 51663. Mag is already flush with barrel and images of extensions beyond their barrels show it just doesn't look right, not to mention the possibility of bending it inadvertently. Why not just buy a 5 or 6 round shell Buttstock Cuff?


I know what you're saying. But I've had an 870 with a 20" barrel for about 25 years that has worn the +3 extension. It makes the mag protrude a half inch or so beyond the barrel. It looks kind of funny, but I've grown used to it. My 870 holds 7+1. The Mossberg 590A1 with a +1 would essentially duplicate this system, but would allow me 9+1. I'm not too worried about inadvertently bending it. This seems to be more of a concern with the +2 extensions because of the amount of leverage that can be applied due to the length of the extension. The end of the Mossberg mag tube has a much longer area in the threads where the extension screws on; it's much stouter than the 870. As near as I can tell, the +1 extension will only protrude about 1" past the barrel.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Apr 07, 2012 10:27 am 
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Hello, I'm new to the forum and found this topic. It's exactly the question I had. I have just bought a 590A1 (52682) and it's my first HD specific shotgun. Out of the box, it would take 6 Hornady critical defense 00's in the tube. There is also about 3/8-1/2" further I can push the shells in, meaning I haven't bottomed out the spring. Does anyone have the details for the material used for the spring and the free length of the spring? I think there is a calculation that tells you what the minimum compressed length should be for theoretical infinite life.

Also, with those of you who have bought the +2 extension like klaatu has shown; what have you done for a front sling mount? Anything, or do just forget the sling at that point?

Thanks in advance for the help!


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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Apr 07, 2012 12:26 pm 
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penzone wrote:
what have you done for a front sling mount? Anything, or do just forget the sling at that point?


Per S&J Hardware description as seen above in wfb18's post above, the kit comes with a 3-position front sling mount. After having received mine, I can attest to that although I've left the mount off for now as seen in my images above.

Just wish badboybeeson would reply to a March 8 PM I sent him regarding my purchase of a second 2d kit. Must have many irons in the fire.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Apr 07, 2012 1:49 pm 
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I looked up the extension and I see the plate that comes with it. However, I like having quick detach sling swivels. Is there a clamp for the A1 that has a threaded hole to attach the factory swivel fitting that comes in the end of the tube cap? That is the only thing keeping me from purchasing the +2 extension right now.


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 Post subject: Re: 590a1 mag cap.
PostPosted: Sat Apr 07, 2012 6:27 pm 
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penzone wrote:
Is there a clamp for the A1 that has a threaded hole to attach the factory swivel fitting that comes in the end of the tube cap?


I know of none.

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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu May 17, 2012 10:27 pm 
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Klaatu wrote:
penzone wrote:
what have you done for a front sling mount? Anything, or do just forget the sling at that point?


Per S&J Hardware description as seen above in wfb18's post above, the kit comes with a 3-position front sling mount. After having received mine, I can attest to that although I've left the mount off for now as seen in my images above.

Just wish badboybeeson would reply to a March 8 PM I sent him regarding my purchase of a second 2d kit. Must have many irons in the fire.


Sorry about the lack of coms my monther i dieing and ive had to fly back to the UK a few times i nthe last while, as well as taking part ownership of another tactical gear company, ive been a bit behind.
as ive posted a few times we are really in need of some more US dealers to help us out but i simplet dont have the time to contact to many of them so any help would be good!
thanks
bbb

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 Post subject: Re: 590a1 mag cap.
PostPosted: Thu Sep 20, 2012 11:05 am 
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Joined: Fri Aug 31, 2012 7:36 am
Posts: 28
You can make one real easy. Get a set of 1" rings, mill, file, grind, etc the bottom flat. I usually use the high mount style as the base has more area to drill and tap. Drill and tap for a sling stud. Then you can use the quick detach slings. If you want to put this on the magazine cap then use a set of rings for an air rifle. These should have plastic inserts. Take those out and it can fit over the magazine cap if altered. Put the rings together with the screws. Use a round file, dremel tool with a sanding drum, etc., to relieve the area where the halves come together as it is tight where the screw bosses are. Then do as above. I have done this on Choate two shot extensions for the Browning A5's. Yes, Choate has two shot extensions for the A5's but they may need a 1/8" spacer. I make these from old magazine caps, friction rings, or what ever I have handy. I have installed the 1" rings on things like the Win. 1300 defender models. I have done some other things with caps using the Uncle Mikes screw stud in the end of the cap also.


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