Choate Tool Thompson Encore M4 Telescoping StockMulti Calibers. An aluminum adapter housing allows the M4 stock to be attached to the Encore receiver grip. Threads in the housing will fit any AR15 telescoping stock. This stock offers a length of pull range form 12 3/4 to 16 inches. All NFA Rules apply. Federal law prohibits use with barrels shorter than 16 inches. Specifications for Choate Tool Thompson Encore M4 Telescoping Stock: Manufacturer: Choate Tool Gun Model: M4 Country of Origin: USA Features of: Aluminum adapter to fit the Encore Pistol grip Comes with a telescoping M4 style stock Can use any AR telescoping stock Polymer construction Package Contents: Choate Tool Thompson Encore M4 Telescoping Stock What firearm models does the manufacturer say Choate Tool Thompson Encore M4 Telescoping Stock is compatible with? The manufacturer suggests that Choate Tool Thompson Encore M4 Telescoping Stock is compatible with M4Choate Tool CMT-09-01-28: Thompson Encore M4 Telescoping StockMulti Calibers