A 15-year-old was traipsing around East Boston with a gun loaded with 11 bullets and a knife when he and two pals got into an argument with an MBTA bus driver because they got on without paying Friday night, the Suffolk County District Attorney's office reports.

The teen, already facing a separate assault-and-battery charge in Chelsea, was ordered held without bail at his arraignment in Chelsea Juvenile Court on charges of being delinquent for two counts of assault by means of a dangerous weapon, unlawful possession of a firearm, unlawful possession of a loaded firearm, possession of a large-capacity firearm, manufacturing an untraceable firearm and unlawful possession of ammunition, the DA's office reports.

According to the DA's office, the three teens got on an MBTA bus at Bennington a

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