fishoffshore

Recently acquired a 12 Gauge FN, BROWNING A5 barrel that has "ACIER STEEL" on the side and 18.3 -CHOKE on the bottom of the barrel. I have no idea how to determine WHAT the CHOKE is. It measures at .6885 of an inch at the muzzle. That is a lot smaller than a " choke" muzzle measurement that I think it would be. I think it's a FULL CHOKE BARREL HELP? !!!!!! PLEASE