Stoeger m3500 with extended tube? 7 rounds legal semi auto?

[apexanimal]

Wondering how common it is to take advantage of 3.5 inch super magnum semis for their increased legal ammo capacity in the tube. By my quick maths it seems with a 3.5 inch shotgun with a tube that holds 5.9 rounds of that length shell, it would also comfortably hold (7) 2 and 3/4 inch shells. I was thinking of trying this on a stoeger m3500, but wondering if anyone else has done similar or wants to share their thoughts on the matter. Seems like itd be great for 3 gun.

 

[thegrandpoohbah]

Don't forget to ghost load for an eighth round.

 

[Garaldtao]

Don't forget to ghost load for an eighth round.

2.5 for the 9th, change out the spring and add a foam spacer for 14 mini's. Add a +2 or +3 extender and get even more rounds but I guess that would only be legal with a plug (no different than a pinned mag). I don't know what would fit the m3500 but an 870 +3 fits my Auto5 and Franchi 48A and I also have a 590 +3 on my 930 with a plug in it of course. I don't know why I do it? It's like a fake suppressor I guess, looks cool but unlike a fake suppressor, when shtf, pop off the cap and take out the plug I guess!?!lol

Here is a secret, if legal non restricted round counts matter. Get into 308 and try to find a MVP lable 20 round magazine. When the MVP first came out, I was the first in line to pickup one but it did not come with any magazines even though they are advertisezed as having 2. I contacted the distributor and they sent me an MVP labled 5/10 rounder and a factory labled 20/20 rounder. If you are not in the know, the MVP is a bolt gun which means there is no magazine restrictions, it is also the only bolt gun that uses AR10 style mags without doing any mods. It is also set up to accept m14/m1a1/m305 mags, also without any mods. I've been stopped by the provincial police while sighting in on crown land with both my MVP and m305 on the same table and they left me to it after looking at the mags. The female officer knows that everyone in these parts knows the firearm laws and she just lives down the road from me. I know they are out there but these 20 rd MVP are like hen's teeth but if you come across one...

 

[sailor723]

2.5 for the 9th, change out the spring and add a foam spacer for 14 mini's. Add a +2 or +3 extender and get even more rounds but I guess that would only be legal with a plug (no different than a pinned mag). I don't know what would fit the m3500 but an 870 +3 fits my Auto5 and Franchi 48A and I also have a 590 +3 on my 930 with a plug in it of course. I don't know why I do it? It's like a fake suppressor I guess, looks cool but unlike a fake suppressor, when shtf, pop off the cap and take out the plug I guess!?!lol

Here is a secret, if legal non restricted round counts matter. Get into 308 and try to find a MVP lable 20 round magazine. When the MVP first came out, I was the first in line to pickup one but it did not come with any magazines even though they are advertisezed as having 2. I contacted the distributor and they sent me an MVP labled 5/10 rounder and a factory labled 20/20 rounder. If you are not in the know, the MVP is a bolt gun which means there is no magazine restrictions, it is also the only bolt gun that uses AR10 style mags without doing any mods. It is also set up to accept m14/m1a1/m305 mags, also without any mods. I've been stopped by the provincial police while sighting in on crown land with both my MVP and m305 on the same table and they left me to it after looking at the mags. The female officer knows that everyone in these parts knows the firearm laws and she just lives down the road from me. I know they are out there but these 20 rd MVP are like hen's teeth but if you come across one...

Just to be clear. Putting a plug in a shotgun tube magazine is more about complying with hunting regs and does not legally limit it's deemed capacity under the Firearms Act. To answer the OP's question.... The tube mag on a semi auto shotgun needs to be crimped or otherwise permanently limited to no more than 5 rounds of the longest shell the gun is chambered for. A plug IS different than a pinned mag and will not make the tube magazine legal.

 

[Buck1950]

Sailor is right about the 5-shell limit. You might get 7 into your 3.5" tube, but more likely only 6; then ghost load added 2. If you remove much spring, that may change your 3.5 count, thus getting you busted in the field.