Factory Remington model 870 barrel 30". Has a 734 bore. Barrel has been threaded for tru- choke thread. Has fiber optic sites. Has a 2 3/4" chamber and has a custom worked chamber. Barrel shoots federal top gun 8s well at 60' and Wagner 9s good at 65' with the Davis 664 choke. Barrel comes with (5) chokes . 648-620 Davis, 664-520 Davis, 662-520 Davis, 653-620 Davis, 661-24l-6w Barrett.