Semi-auto Magazine Extension Limiters

Mr.Sparkle

Mr.Sparkle

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Howdy,

I know the rules about semi-auto shotgun magazine limits, but I am trying to figure out the "best" way to plug a magazine extension.

I have heard of people gluing wooden dowels to the extension end-cap. How well does that work? What other techniques have you used?

This will be for a Stoeger M3K. I plan to use a Nordic Components extension.

Thanks!

Scott
 
Carriage bolt through the drain hole in the end cap. Stake the crap out of the threads above the nut so that it is on permanently.

This allows the spring to stay less compressed to make loading easier and the follower is blocked by the bolt. Requires some tinkering with bolt length to get the capacity where you need it to be.
 
1/2" diameter wood dowel.

Use automotive goop to glue it permanently to the end cap of your Nordic tube.
Be careful not to get any goop on the threads.

8ae554d3-8f01-4fe0-82bd-698f2699609a_1.a6a77de824d5560d57459ab195c44506.jpeg


This is how IRG limits all of their Mossberg JM 930s that they bring across the border.
 
On my Stoeger with Nordic extension I took the original mag limiter and filed it down to appropriate size, then JB Welded it to the mag cap with holes drilled in the disc on the end of the mag limiter to allow the goop to "bite" and screwed it to the mag cap through the drain hole. Filled the Robertson screw head with JB Weld, painted it flat black.
 
Thanks folks!

Smelly Pete... What length NC extension did you put on yours and where did you buy it? Did you end up using the NC follower, or the stock one?
 
Mr.Sparkle said:
Thanks folks!

Smelly Pete... What length NC extension did you put on yours and where did you buy it? Did you end up using the NC follower, or the stock one?
Click to expand...

+3 for the extra spring length/less compression, as Stevo said it allows easier loading. Got it from Casey at Tactical Ordinance, ordered the NC follower and the Taran Tactical safety at the same time.
 
how would you limit the mk1919a from 5 rounds to 2/3 for hunting?
with the detachable mags?
would you have to permanently pin one with a bolt/rivet?
 
how would you limit the mk1919a from 5 rounds to 2/3 for hunting?
with the detachable mags?
would you have to permanently pin one with a bolt/rivet?
Click to expand...

To comply with Ontario hunting regs; It does not need to be a permanent block.
 
i cant see myself using it for hunting anyways but...good to know
a wooden block or something at the bottom of the rounds to take up space so only 2 in the mag and one in chamber would work?
id probably only be using a single slug anyways in the barrel/chamber.
 
a wooden block or something at the bottom of the rounds to take up space so only 2 in the mag and one in chamber would work?
Click to expand...

Yes. A piece of wood under the floorplate would be perfectly fine.

It doesn't need to be glued or riveted in.

And don't have any spare unblocked mags on your person, while out in the bush.
 
I blocked my big NC extension by riveting in a piece of aluminum tubing from aircraft spruce. Select the appropriate OD and get the thinnest wall. Should allow the spring to slide inside it while stopping the follower. You will need to drill a 1/8" hole through the extension and your aluminum tube.

http://ww w.aircraftspruce.ca/catalog/mepages/alumtube_6061t6.php


I would suggest this is probably slightly more legal than blocking from the end cap... as I believe its supposed to be the mag body itself that is limited. If you block with a bolt etc secured to the cap its simply a matter of swapping the cap and you're in trouble...
 
I blocked my big NC extension by riveting in a piece of aluminum tubing from aircraft spruce.
Should allow the spring to slide inside it while stopping the follower.
Click to expand...

ALUMINUM_TUBING.jpg


That's actually a pretty neat idea. Never heard of that method before.
 
BeerBaron said:
I blocked my big NC extension by riveting in a piece of aluminum tubing from aircraft spruce. Select the appropriate OD and get the thinnest wall. Should allow the spring to slide inside it while stopping the follower. You will need to drill a 1/8" hole through the extension and your aluminum tube.

http://ww w.aircraftspruce.ca/catalog/mepages/alumtube_6061t6.php


I would suggest this is probably slightly more legal than blocking from the end cap... as I believe its supposed to be the mag body itself that is limited. If you block with a bolt etc secured to the cap its simply a matter of swapping the cap and you're in trouble...
Click to expand...

BB,

You bring up a really good point about blocking techniques that attach to a removable end cap. That would be the same as blocking AR mags using the floor plate and not using a rivet in the mag body.

For your rivet, did you install it near the end cap to reduce possible interference with the mag spring? Got any pics of your install you could share?

Thanks,

Scott
 
You bet...



A couple notes...

You will need to de burr the tube once its cut obviously to allow the spring to slide in smoothly. You can also see I put a couple wraps of electrical tape around the tube to snug up the fit and keep it centered. Make sure when you install the tube it contacts the end cap, as I had a piece that was short and the recoil was causing it to shear the rivets after 100 rounds or so, not an issue if it is in contact with the end cap. I have tried a few different materials (delrin, pex etc) and found this to be the best I have used yet. My rivet location does require you to thread the spring into the tube past the rivet, which as you suggested could be alleviated by placing the rivet closer to the end. I have plenty of plug past the rivet so there are no issues with the spring binding in mine as it is. Can't recall exactly what size tubing I had ordered but there's a scrap piece in the shed I could go check.
 
Also.. if you want your rivet to remain timed make sure you install the extension tube the same way every time.. I like to tighten the nut down, then install the tube into the nut already on the gun. This should keep the rivet facing the same direction if you want it up or down etc.
 
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