First, ask these questions:
1. Am I using Std 2+3/4 shells? If you can’t fit at least 4 in the magazine, there is a plug. Also,
2. How many shells can I fit in the magazine now? Line up 4-5 shells end to end and place the magazine next to them.; would they all fit?
3. Have I ever opened the magazine since I obtained it?
If you aren’t sure, open the magazine.
My Rem was “shipped” with a plug but it had a warning label.
I can fit 6+1 of 2+3/4 in my Rem.
I routinely shoot 3-inch mag so I’m limited there.
I hate steel shot so the more the merrier.
First Q should be 3, not 4.