A lot of the older barrels were larger bore. The AA barrels were around 0.693 I think. The large size was part of the reason they worked so well. The stock AGD crown point barrel was around the same size but was a single piece.
Originally Posted by BTAutoMag
The lapco at 0.697" was the largest bore that I knew about as a single piece barrel. I have an Empire barrel kit that has 0.696" backs. The freaks have 0.695" backs.
Except for the Automag in front, its usually the man behind the equipment that counts.