Choate Tool Mossberg 500/590 Telescoping Stock12 Gauge. The telescoping stock is our M4 stock with heavy duty tube designed to take the recoil of 3 1/2 inch 12 ga. Length of pull is from 12 to 15 1/2 inches. The stock has 6 different places for sling attachment including a flush cup for push button QD sling mounts. Weight 2 lb. 6 oz. Specifications for Choate Tool Mossberg 500/590 Telescoping Stock: Manufacturer: Choate Tool Country of Origin: USA Features of: Telescoping configuration for adjustable length-of-pull Uses Choate M4 style butt stock Includes sealed battery compartments Package Contents: Choate Tool Mossberg 500/590 Telescoping Stock Choate Tool CMT-02-01-27: Mossberg 500/590 Telescoping Stock12 Gauge