[tacticalogic]

A 24-26” barrel isn’t that unwieldy.

Five 3" shells is 15", and then you have to allow for the spring.

I'd think a 24" barrel would support at most a 6 round magazine. After that you have to start lengthing the barrel in 3" increments for every additional round.

[Spktyr]

Again, 2 3/4” is the standard size for a 12ga to chamber, not 3”.