Police said a 19-year-old man was confronted in the Hill Street area of Lurgan, Co Armagh, yesterday evening shortly before 5.15pm.
The teenager ran off and was not injured.
Police said the arrested man was detained a short time later on suspicion of possession of a firearm with intent, assault on police, resisting police and criminal damage.
Officers appealed for anyone who witnessed the incident or anyone with any information to contact them.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com