Probably too many posts here to get an answer but with pump action shotguns that list like a capacity of three is there a removable plug or something that expands the rounds of the gun and I assume that would still work with a shortened barrel?
Lost all my weapons and ammo in a freak kayak accident so I’m back in the market. I think everybody should have some home protection but just 2 or 3 rounds? Ridiculous.
Our little hand shower head had a little doohickey that seemed to cut down on the water flow. I’d taken the dang thing completely apart before I saw the problem. No disassembly required.
My wife kisses and hugs me on a regular basis these days now for no apparent reason. Weird.
;-)
2 or 3 rds. Limit is for hunting Game.
Get to know your local gun shop
Is the best advice.
Mosseburg makes factory barrels in various lengths for Rem 870 and the
Moss 500 as well as all their other shotguns. On the 500. Removing the barrel bolt holding it to the guns magazine tube allows removal of the plug expanding the available mag capacity. It also messes with migratory bird hunting rules. You can learn a lot on YouTube but hunting rules are best researched at you local Fish and Game office. Stay safe.

If You have a different Brand of Shotgun just Search that Model for a Diagram like above OR SEARCH for Owners Manual that You should have anyway.
Most Manufactures will send one for FREE.