I have a new, never shot standard manufacturing SKO tactical shotgun.  It's length is over 26” and has an 18 5/8” barrel made from 4140 steel that accepts both 2 ¾” and 3” shot shells; which can be loaded in the included 5 round magazine.  It's a safe queen, and not my choice for home defense weapons.   It cycles all shells flawlessly, and is one of the most reliable USA made shotguns on the market.