1) Browning 32" vent rib 12ga barrel shotgun barrel. 2 3/4" chamber, marked * (full) choke. 2) Browning 32" vent rib 12ga barrel. Marked 3" chamber, marked * (full) choke. 3) Browning 30" vent rib 12ga barrel. Marked 2 3/4" chamber, marked *(full) choke. 4) Browning 28" vent rib 12ga barrel. Marked 2 3/4" chamber, marked * (full) choke. 5) Browning 26" vent rib 12ga barrel. Marked 2 3/4" chamber, marked ** (modified) choke. 6) Winchester Model 1200 28" round 12ga barrel. Marked 2 3/4" chamber, Win-choke system (full installed). 7) Browning 24" round 12ga barrel. Marked 2 3/4" chamber, no choke marking.