There's nothing wrong with your gun. The Remington mag tube only holds 3, 3" shells. Remember that 3, 3" shells ADD 1 1/2 inchs extra shell length to the mag, so there just isn't enough room for another 3" shell.
I don't understand how your friends are fitting an extra 3" shell in there, since Remington says three is the limit.
EDITED FOR A LATER IDEA:
You're not by chance using a Remington Express model are you, and your friends are using older Wingmaster guns???
If so, the Express uses a different mag tube design with a longer end cap assembly.
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