In a large bowl, whisk together the oil, brown sugar, paprika, onion powder, garlic powder, salt, and pepper. Add the wings to the bowl and toss to coat evenly. Cover and refrigerate for 15–20 minutes.
Heat your outdoor gas grill to medium-high (about 400°F). Brush the grates lightly with oil to prevent sticking.
Remove the chicken wings from the marinade (letting any excess drip off) and place them directly on the grill. Discard any remaining marinade.
Grill for 25–30 minutes, turning occasionally, until the chicken is golden brown, no longer pink, and the internal temperature is cooked through to 175°F (the higher temperature makes it easier to get it off the bone).
While the chicken wings are grilling, prepare the sauce by whisking together the hot sauce and melted butter.
Transfer the grilled wings to a large bowl, pour the buffalo sauce on top, and toss until well-coated.