Choate Tool T/C Encore M-4 Pistol GripMulti Calibers. All NFA Rules apply. Federal law prohibits use with barrels shorter than 16 inches with buffer tube & stock attached. Specifications for Choate Tool T/C Encore M-4 Pistol Grip: Manufacturer: Choate Tool Gun Make: Thompson/Center Arms Gun Model: M4 Color: Black Country of Origin: USA Features of Choate Tool T/C Encore M-4 Pistol Grip Use AR buffer tubes and butt stocks. Integral pistol grip. Package Contents: Choate Tool T/C Encore M-4 Pistol Grip What firearm models does the manufacturer say Choate Tool T/C Encore M-4 Pistol Grip is compatible with? The manufacturer suggests that Choate Tool T/C Encore M-4 Pistol Grip is compatible with M4Choate Tool CMT-09-03-14: T/C Encore M-4 Pistol GripMulti Calibers