16 INCH VARMINT A4 UPPER HALF, 18 INCH VARMINT A4 UPPER HALF, 20 INCH VARMINT A4 UPPER HALF, 24 INCH VARMINT A4 UPPER HALF WITH 1:8 TWIST BARREL, 24 INCH VARMINT A4 UPPER HALF WITH 1:12 TWIST BARREL