Mix the barbecue sauce, orange zest, orange juice, sriracha, honey and dijon mustard together in a large bowl. Add the chicken wings and toss to combine. Cover and let marinate for at least 30 minutes in the refrigerator.
Heat the grill to medium high heat.
Place the chicken wings on the grill and grill about 8 minutes per side.
While the wings are grilling, prepare the glaze. Melt the butter in a small saucepan on a medium high heat. Whisk in the honey, mustard and orange zest. Bring to a simmer and reduce heat to low.
Pour a little of the glaze into a small bowl. When you flip the chicken over, brush a little of the glaze over each chicken wing and continue cooking. Discard the glaze in the bowl.
After the wings are thoroughly cooked, place them on a large serving platter and pour the remaining glaze from the pot over the wings.