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Mossberg 590A1 mag extension, help me find one!!!

This is a discussion on Mossberg 590A1 mag extension, help me find one!!! within the Shotguns forums, part of the Gun Forum category; Originally Posted by redlegagent Second video more informative. First - when you reassemble the weapon, make sure the bolt is to the rear when you ...


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Old November 11th, 2010, 10:33 AM   #16
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Quote:
Originally Posted by redlegagent View Post
Second video more informative. First - when you reassemble the weapon, make sure the bolt is to the rear when you insert the barrel. My point is it is possible - when the bolt is forward - to not fully seat the barrel in the reciever. When you screw it down, it looks okay but if you rack the bolt back and look in the reciever, the barrel will be slightly forward. Second - many new Mossberg owners do this. Mossberg rates shell capacity on 2" shells. My gun is "rated" to hold 9 shells. It only holds 7 - 2 3/4" shells or less for all 3" magnums. If your gun is rated for 6 shells - thats 5+1 of the 2" defense shells. People will try to jam 6 - 2 3/4" into the magazine and screw it up. You shouldn't need all that grease. I would try flushing the magazine tube under hot water to flush it out and then insert a small clean rag from the reciever side into the tube (carefully ) to swab the tube out. It looked like you were putting 3" shells into it and it was binding on the first round but worked when the spring tension was reduced on subsequent rounds. Your magazine will probably only hold 4 - 2 3/4 +1 - don't over force rounds into the magazine.

" = New. IMPORTANT NOTES: CAP: Capacity - includes one in chamber. 500 & 590 Models: one less for 3" shells. (Pending ammunition tolerance variations, total capacity may be reduced by one additional round.) "

Commercial loads range from 2" , 2 3/4", and 3" magnums. They base it on the smallest round available.
Well I assure you they were 2"3/4 shells not 3"ers. I mean you could see in the video I fit 5 in the tube easily. I could fit 6 of the Hornady Light Magnums in it because they were smaller for some reason. I'll double check the barrel tonight to make sure it's seated properly.
Honestly I don't know how to get the magtube off or the spring out. I'll probably need channel locks or something.

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Old November 11th, 2010, 12:15 PM   #17
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Quote:
Originally Posted by Green66Chevelle View Post
Well I assure you they were 2"3/4 shells not 3"ers. I mean you could see in the video I fit 5 in the tube easily. I could fit 6 of the Hornady Light Magnums in it because they were smaller for some reason. I'll double check the barrel tonight to make sure it's seated properly.
Honestly I don't know how to get the magtube off or the spring out. I'll probably need channel locks or something.
Don't try to remove the spring. Just flush it out to clean it. If you lined up different shells side by side, you will notice variations in over all length. This is due to variations in load and crimp. This is what Mossberg's statement means - variations could affect the number of shells you can load. Again, my gun is rated for 9 shells - 8+1. I can load 7 - 2 3/4" shells into my magazine with about 1.5" play remaining - not enough for another shells unless I force it in. If I mix 2 3/4" shells with 3" shells, it will reduce the number held due to size variations. If I loaded the smaller 2" personal defense loads, I could load the full 8 shells it's rated for plus 1 in the chamber for 9 total. Your gun is rated for 6 shells 5+1. You may indeed be able to get 5 shells in like you say, but if you load 4 and the 5th hangs up part of the way in - that may be all it will hold. It could be the a previous user jammed too many shells in which has caused the spring to bind inside the tube so it feeds erratically. You had trouble chambering the first round but the remaining 4 rounds chambered okay - think about it.

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Old November 11th, 2010, 12:18 PM   #18
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The mag tube unscrews from the receiver in the usual direction. do NOT use chan'l'locks or any other pliers.

A strap wrench might be okay. I doubt there's anything wrong with the mag tube that can't be fixed by a good cleaning, leaving it in place on the receiver. Nothing in your videos or description suggests that the mag/spring/catch/interrupter is doing anything but what it's supposed to. The spring retaining clip at the front of the mag tube comes out by just prying one side a bit, then the other, use a flat screwdriver wrapped in masking tape or something. Don't pry too much at a time or you'll bend it.

Your issue is on chambering, and I'll wager it's the problem I describe above.


Your second vid, the first round jam looked EXACTLY as described in my posts above. Do as I suggest and press upward on the elevator or the underside of the shell (before you release forward pressure on the jammed round) and see if it slides into position.

I feel like i'm saying the same things over again...

I bet you a nickel if you do as I suggest your problems will be solved. It's not that hard. Get a fine diamond file/india stone or something similar and just do it. Worse case you bugger up your extractor and you have to buy another one for 4 bucks or something.


Also fyi there should be a manual focus setting on your camera, or Macro setting, so it'll be in focus when you're up really close.

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Old November 12th, 2010, 06:41 AM   #19
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Thanks for your help fellas. It's been a little rough trying to comprehend your suggestions because I'm not very familiar with these but since I've been talking to you it's made a big difference. I'm going to mess with it more this weekend, I'll post how it goes then.

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Old November 12th, 2010, 10:04 AM   #20
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Just read through the posts carefully again and let us know if you don't understand something.

To be clear; my suggestions may help with the chambering/jam issue. They will do nothing to help with the misfire issue. Making sure the barrel is fully seated might help with that, but I suspect you have either a broken/worn firing pin, a grunged up bolt/spring/pin, or MAYBE a weak hammer spring (unlikely).

also, to be very clear: if you follow my suggestions, the area that needs to be polished/cleaned up is the inside, rear face of the extractors (or hooks as you said). One on each side of the front of the bolt. Don't mess with the triangular shaped front portion or the sharp hook. The inside, rearmost face of the extractors (facing inward toward the center, the area where the rim of the cartridge has to slide up into position) is where you want to carefully file/polish. IF there's significant resistance when chambering, and it looks TO ME like that might be your problem.

You might also try some different brands of ammunition.

But a properly tuned 590 should eat just about anything.

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Old November 27th, 2010, 02:36 PM   #21
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For what it's worth, you get the magazine spring out by prying out the C-shaped retainer under the cap. Once you unscrew the endcap, use a large screwdriver and GENTLY pry all the way around until the piece comes out. Try not to bend it. I put an extra power spring in mine a long time ago. I used a large round nylon brush, similar to a bore brush, to clean the inside of the tube. The retainer can be tapped back in with the screwdriver handle or a mallet.

When seating the barrel, have the bolt HALFWAY back, not fully closed (that's what it says in my instruction booklet!). Once the barrel is fully seated and the magazine cap tightened, then close the bolt.

On you second video, you do seem to be racking it a bit gingerly when it jams up on the first shell. It's designed to be racked HARD.

Although it may be nothing, your left extractor doesn't seem to look as sharp as mine does.

Quote:
Originally Posted by redlegagent View Post
Mossberg rates shell capacity on 2" shells. My gun is "rated" to hold 9 shells. It only holds 7 - 2 3/4" shells or less for all 3" magnums. If your gun is rated for 6 shells - thats 5+1 of the 2" defense shells. People will try to jam 6 - 2 3/4" into the magazine and screw it up.
Mine was rated 8+1 and holds 8+1 of the 2 3/4" shells. I just verified it. I do not have to force the last one in at all. I can even push the last one in a further 1" before it stops. Are you sure they rate their capacities using 2" shells? My 20" A1 on their website says 9 shot capacity. If it were 2" shells, shouldn't it be more like 10 shot? Do you have a 20" barrel with a full length magazine tube? If you do, ever checked inside the magazine for a plug?


Last edited by flesheatingvirus; November 27th, 2010 at 02:57 PM.
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Old December 17th, 2010, 12:07 PM   #22
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Thanks a lot for your help fellas, I haven't had time to mess with this project lately, sorry if I didn't respond to your posts.

I'm just going to send it to Mossberg and have them do whatever they need to get it to work. I'll feel more comfortable that way.

Here's a link to a forum with a guy that has a magazine extension on his 590A1 which is basically what I'm looking for, once I get my function issues worked out.
http://www.thehighroad.org/showthread.php?t=207869
Maybe I'll just call his shop and ask him.

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Old December 30th, 2010, 11:04 AM   #23
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You are making the right choice to send it to Mossberg. I have a 590A1 that was 5+1. Mossberg converted it. It requires the 20" barrel for extended mag tube. There was no labor charge, parts only. They went through the whole gun & it came back like new.

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