What is the situation if using an Opsol mini-clip to allow loading 1 3/4" shells into a 5 round rated tube as in Mossberg 500 series shotguns?
As long as it’s plugged to 5 of the longest cartridge the gun can chamber, then you’re okay. A magazine extension is just that, an extension. It’s a modification to the existing magazine, because on most shotguns the magazine is not removable. The “happens to fit” is irrelevant because it’s not actually a magazine on its own.



























