Magazine capacity question [Archive] - Glock Talk

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sambeaux2249
10-05-2010, 18:05
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

philbun
10-06-2010, 06:23
I was wondering the same thing. Hope someone replies soon...

B.Reid
10-06-2010, 06:27
:wow:

Jon_R
10-06-2010, 06:56
What is the difference? The magazine tubes are all the same length, right?

Just wondering. Thanks.

Sam

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".

Spiffums
10-06-2010, 07:32
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.

method
10-06-2010, 08:26
S&B buck shells are longer than most due to the crimp used, so tube mags will hold one fewer.

Z71bill
10-06-2010, 09:04
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.

aippi
10-06-2010, 10:58
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.

sambeaux2249
10-06-2010, 11:50
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.

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

aippi
10-06-2010, 12:07
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.

jhooten
10-06-2010, 14:40
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.

ET.
10-10-2010, 18:47
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.

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

jhooten
10-10-2010, 20:58
If I remember, on Tuesday I'll take a pic of the two springs together and you can see why.

sambeaux2249
10-11-2010, 00:36
If I remember, on Tuesday I'll take a pic of the two springs together and you can see why.

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

jhooten
10-11-2010, 07:08
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.

DFin
10-11-2010, 10:37
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.

Jamesey
10-12-2010, 17:30
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.

jhooten
10-12-2010, 21:53
In the first two you can see the difference in the coil count between the two springs.

http://i40.photobucket.com/albums/e236/jhooten/IMG_0070.jpg
http://i40.photobucket.com/albums/e236/jhooten/IMG_0071.jpg

and the overall length
http://i40.photobucket.com/albums/e236/jhooten/IMG_0072.jpg

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

sambeaux2249
10-12-2010, 22:32
Thanks for the photos... and that lets you get an extra round in the mag? Hmm...

Sam

jhooten
10-13-2010, 10:52
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.
http://i40.photobucket.com/albums/e236/jhooten/spring4.jpg

See the difference now?

sambeaux2249
10-13-2010, 13:33
Wow!! That's one hell of a difference! I had no idea!

Thanks for that demonstration.

Sam

nolt
10-13-2010, 14:50
great thread!

ive wondered this. and wondered why aftermarket ext's for the 870 still only yield six.

need to get one of the guys (or just guy) that actually got a MAX100 extension to compare the supplied spring with that to the remington and mossy springs.

DFin
10-13-2010, 18:06
With all those extra coils, does the Remington spring last any longer than the Mossberg spring?

Z71bill
10-14-2010, 08:36
With all those extra coils, does the Remington spring last any longer than the Mossberg spring?


Logic would say yes - but with springs it is never that simple.

Many people think if you clip a few coils off a spring it makes it weaker - when in fact it makes it stiffer.

Silverhawk500
10-16-2010, 17:58
If you would like more mag capacity------- google X-rail, I could not get the link to go on here. Enjoy
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