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Magazine capacity question

Discussion in 'Tactical Shotguns' started by sambeaux2249, Oct 5, 2010.


  1. sambeaux2249

    sambeaux2249
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    So, I have a mix of 20" and 18.5" pump shotguns. I'm curious what the limiting factor is on magazine capacity. What I mean is, why can I fit 7 rounds in my other 18.5" shotguns, but NOT in my Remington 870?

    I have a Benelli Nova Tactical that can hold 7 in the magazine. The magazine extension is flush with the end of the barrel.

    I have a Hawk Industries 982 that can hold 7 in the magazine, and it's a blatant copy of the 870. It also have an 18.5" barrel with an extension that's flush with the end of the barrel.

    I have a Pardner Protector that can hold 7 in the magazine, and it's another blatant copy of the Remington 870.

    Then I have a Mossberg 590 that holds 8 in the magazine.... But my Remington 870's with 20" barrels only hold 7, and so does my 20" barreled Maverick... What is the difference? The magazine tubes are all the same length, right?

    Just wondering. Thanks.

    Sam
     

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  2. philbun

    philbun
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    I was wondering the same thing. Hope someone replies soon...
     

  3. B.Reid

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  4. Jon_R

    Jon_R
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    If you have all these shotguns measure the tubes and see if the are the same length. It is a very simple design longer the tube more shells. The only thing that can make a tube the same length hold more or less shells is the design of the follower. Some have long tails on them so they eat up space in the tube.

    My 590 20" the tube is flush with the end of the barrel. My 590A1 18.5" the tube is short of the barrel by about 4".
     
  5. Spiffums

    Spiffums
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    How much does it lack of taking that last round? I know with regular shot shells (7 1/2 shot low brass) I can get 1 more in the tube than with S&B Buckshot.
     
  6. method

    method
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    S&B buck shells are longer than most due to the crimp used, so tube mags will hold one fewer.
     
  7. Z71bill

    Z71bill
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    My guess --mag spring difference -

    Some guns have really thin gauge steel and the minimum number of coils -- other guns have heavy duty mag springs - thicker steel & more coils

    A heavy duty spring - when fully compressed will take up more room in the mag tube leaving less for the shells.
     
    #7 Z71bill, Oct 6, 2010
    Last edited: Oct 6, 2010
  8. aippi

    aippi
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    If you look at the end of your Remington tube extensions you will see the end is smaller then the tube. This is for the bayonet to fit on the shotgun since the tube extensions were first designed only for their Military shotguns. Yet, in all these years they have not changed that design. If they would simply allow the tube to be the same out to the end, you could get that extra round in there.

    You would think that a company as large as Remington would make this change as a matter of market demand.
     
  9. sambeaux2249

    sambeaux2249
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    Hmm... Okay. I know there are some good aftermarket mag tube extensions out there. Are there any that will fit flush with the muzzle on an 18.5" barrel and give me that extra round? How about one that will fit flush with the muzzle of a 20" barrel and fit an extra round? Thanks.

    Sam
     
  10. aippi

    aippi
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    While we are on the subject. Wilson makes the best value in a tube extension on the market, however, they only make 2rd and 1 rd and only for the Remington and they were for the 18" barrels. Being all Remington barrels are now 18.5", Wilson could simply add 1/2" and get an extra round. Again, market demand so calling them and asking about this will help. Enough calls and they see the market.
     
    #10 aippi, Oct 6, 2010
    Last edited: Oct 6, 2010
  11. jhooten

    jhooten
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    Put a Mossberg spring in a Remington extension and you will get your extra shell. Put a Remington spring in a Mossberg and you will loose a shot.
     
  12. ET.

    ET.
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    Looks like this is your answer. I might order a Mossberg spring & do this.
     
  13. jhooten

    jhooten
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    If I remember, on Tuesday I'll take a pic of the two springs together and you can see why.
     
  14. sambeaux2249

    sambeaux2249
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    Sounds good, thank you. I'm not sure I want to swap the springs though... There wouldn't be any reliability issues, would there?

    Sam
     
  15. jhooten

    jhooten
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    In my daily use 870 I would not change the spring just just to get the extra shell. I used a Mossberg spring to get customers 870 running for him until a replacement came in. He said it fed ok.
     
  16. DFin

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    I have a Tank's Rifle Shop mag extension on my 20 in. 870 that is flush with the barrel. It only holds 7 rounds in the mag tube. It has the stock plastic Remington follower and the spring that Tank's sent me. My Mossberg 590A1 with 20 inch barrel holds 8 in the mag tube. This leads me to believe that the follower or the mag spring has something to do with the mag tube capacity.
     
    #16 DFin, Oct 11, 2010
    Last edited: Oct 13, 2010
  17. Jamesey

    Jamesey
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    The mag tubes are different between the Mossy 500 and 590. The 500 has a solid plug at the end which is threaded for the bolt the secures the barrel. The 590 is an open tube all the way to the end. It's threaded on the outside for the end cap. The 500's plug reduces the inside length, allowing only 7 shells.
     
  18. jhooten

    jhooten
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    In the first two you can see the difference in the coil count between the two springs.

    [​IMG]
    [​IMG]

    and the overall length
    [​IMG]

    Both springs are from the 20 inch barrel length mag tubes.
     
  19. sambeaux2249

    sambeaux2249
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    Thanks for the photos... and that lets you get an extra round in the mag? Hmm...

    Sam
     
  20. jhooten

    jhooten
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    The spring in the mossberg is shorter and the coils are wider. If I had a way to show the compressed length of both springs (working on it) it would be more clear.

    Got it.
    [​IMG]

    See the difference now?
     
    #20 jhooten, Oct 13, 2010
    Last edited: Oct 13, 2010