2 3/4” or 3” chamber

Greg, Century International Arms, who imports this Shotgun, specifically lists this as having a 3 Inch Chamber Sir.

it has a 3 inch chamber see ***** FAMILY:1887 Series MODEL:Adler A110 TYPE:Shotgun ACTION:Lever Action FINISH:Blued STOCK/FRAME:Wood Stock STOCK/GRIPS:Turkish Walnut WEIGHT:7.9 lbs. CALIBER/GAUGE:410 Bore CAPACITY:4 + 1 BARREL:20" OVERALL LENGTH:37.75" **