Banjo Gm7 chord (Open G)G minor seventh on the 5-string banjo: 3 3 3 3, and 6 more shapes

Frets, string 4 to string 1: 3 3 3 3 (first position) · 5th string completes it

1. String 4 (D): 3rd fret, index finger (barre), F
2. String 3 (G): 3rd fret, index finger (barre), B♭
3. String 2 (B): 3rd fret, index finger (barre), D
4. String 1 (D): 3rd fret, index finger (barre), F
5. String 5, the short g: open, G, in the chord

Sounds: F B♭ D F  ·  Gm7 is G, B♭, D, F (1 · ♭3 · 5 · ♭7)

The 5th string: the short g is the root of Gm7, so let it ring.

With a capo: on the 5th fret it’s 0 2 1 3 (frets counted from the capo), an open Dm7 shape. Spike the 5th string at the 10th fret to keep it in tune with the capo.

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