Banjo Amaj7 chord (Open G)A major seventh on the 5-string banjo: 7 6 5 6, and 2 more shapes

Frets, string 4 to string 1: 7 6 5 6 (from the 5th fret)

1. String 4 (D): 7th fret, little finger, A
2. String 3 (G): 6th fret, middle finger, C♯
3. String 2 (B): 5th fret, index finger, E
4. String 1 (D): 6th fret, ring finger, G♯
5. String 5, the short g: open, G, not in the chord

Sounds: A C♯ E G♯  ·  Amaj7 is A, C♯, E, G♯ (1 · 3 · 5 · 7)

The 5th string: the short g rubs against the G♯ in this shape, a semitone away: some players let it ring, some skip it.

With a capo: on the 2nd fret it’s 0 0 0 4 (frets counted from the capo), an open Gmaj7 shape. Spike the 5th string at the 7th fret to keep it in tune with the capo.

Open G tuning: gDGBD, the short 5th string first, then strings 4 to 1.