Hunters Specialties QuadGrunter, Deer Call, XL 2.0New & Improved internals produce Mature Buck; Young Buck; Doe & Fawn vocalizations better than ever. For a fully adjustable, no nonsense call, look no further than the QuadGrunter XT 2. 0 from Hunters Specialties. The QuadGrunter XT2. 0 features an adjustable o ring which gives it the versatility of four calls in one; simply move the o ring along the soundboard inside the mouthpiece to project mature buck grunts, young buck grunts, doe bleats or fawn