Magazine Tube Extensions on Short Barrelled Shotguns

Maple Leaf Pilgrim

Maple Leaf Pilgrim

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Hey all,

Quick question about the practicality of putting a +1 or +2 round mag tube extension on a short barrelled pump shotgun. How feasible is it? How easy it it to do? Are there any tricks to trimming back the mag feed spring? Is it wise to get a no-jam follower to go with the extended tube length?

Looking forward to hearing from those who have experience with this.

Cheers,


-S.
 
If you put a mag tube extension on your shotgun, you will need a longer mag tube spring. Some mag tube extensions come with a new spring and follower, which is the easiest route to go. It is recommended that your spring length is 12-16" longer than your mag tube. Most springs come in a 1 meter length that you cut to fit your application.

If you are doing this on a Remington 870, the majority of them have dimples at the end of the mag tube that prevents the mag tube spring retainer from coming out the end of the tube (unless lined up perfectly with the groves in the retainer). These dimples will prevent shotshells from going into the extension, and will need to be flattened or removed (lots of YouTube videos on how to).
 
Need more details. What gun? Have you already found an extension for it?

Not all guns can take an extension - Mossbergs generally can't for instance, the mag tube is solid at the end. My turkish semi also can't without modifying the gun, there is a lip at the end of the mag tube you'd have to remove (which I've seen done, but haven't bothered with myself).
 
jetfixer said:
If you put a mag tube extension on your shotgun, you will need a longer mag tube spring. Some mag tube extensions come with a new spring and follower, which is the easiest route to go. It is recommended that your spring length is 12-16" longer than your mag tube. Most springs come in a 1 meter length that you cut to fit your application.

If you are doing this on a Remington 870, the majority of them have dimples at the end of the mag tube that prevents the mag tube spring retainer from coming out the end of the tube (unless lined up perfectly with the groves in the retainer). These dimples will prevent shotshells from going into the extension, and will need to be flattened or removed (lots of YouTube videos on how to).
Click to expand...

Cheers. I was hoping for the dirty details about measuring and cutting the magazine spring. I never thought about internal protrusions in the mag tube, good to know!

-S.
 
Suther said:
Need more details. What gun? Have you already found an extension for it?

Not all guns can take an extension - Mossbergs generally can't for instance, the mag tube is solid at the end. My turkish semi also can't without modifying the gun, there is a lip at the end of the mag tube you'd have to remove (which I've seen done, but haven't bothered with myself).
Click to expand...

I am looking at throwing an S&J +1 or +2 on a 14"bbl Mossberg 590A1.

-S
 
20210423_134201.jpg
+1 from S&J hardware. They can be ordered with a magazine plate. I made this HK style one though. I ordered a Heavy duty spring and cut it to the recommended 12 to 15" sticking out of the mag tub before compressing it under the cap.
 

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jetfixer said:
If you put a mag tube extension on your shotgun, you will need a longer mag tube spring. Some mag tube extensions come with a new spring and follower, which is the easiest route to go. It is recommended that your spring length is 12-16" longer than your mag tube. Most springs come in a 1 meter length that you cut to fit your application.

If you are doing this on a Remington 870, the majority of them have dimples at the end of the mag tube that prevents the mag tube spring retainer from coming out the end of the tube (unless lined up perfectly with the groves in the retainer). These dimples will prevent shotshells from going into the extension, and will need to be flattened or removed (lots of YouTube videos on how to).
Click to expand...

I've seen competition shooters in the USA prefer their springs anywhere from 5" to 15" past the end of the tube which is a big range. If you have too long of a spring you risk a double feed from too much pressure..
 
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