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Hi Charles and welcome. This is the Beretta A400 Xtreme and has a 3.5" Chamber. Cheers, stay safe and enjoy!

Hi Charles, the Beretta A400 Xtreme Plus KO model J42XS18L has a 3½ inch chamber. Stay safe & have a great day!

Good evening to you!! The Beretta A400 Xtreme PLUS KO 12 Gauge Left Handed has a 3.5" chamber. It will handle 3.5", 3", and 2.75". Hope this helps. Have a good rest of your day. 🇺🇸🇺🇸 'merica' 🇺🇸🇺🇸

The correct chamber length IS 3.5". So 3.5" & 3" & 2-3/4" will all work.

Hello Charles, this firearm has the 3.5" chamber size. Hope this helps and happy shooting!