LEO GEN II TELESCOPING STOCK ADAPTER FOR MOSSBERG 500/590A1/MAVERICK 88 LEOA(R) Gen II Telescoping Stock Adapter For Moss 500/590A1/Mav88 (12-GA And 20-GA) Use Mesa Tactical's collapsible stock kits and adapters to install AR-15 adjustable buttstocks and pistol grips onto the venerable Mossberg 500 shotgun platforms for the ultimate in tactical shotgun configuration performance. The LEO adapter is MESA's most basic, best-selling model, and features an optimal stock elevation allowing the use of iron sights or even the bead sight. The concept behind the telescoping stock system is simple: the shotgun stock is replaced by an adapter, which attaches to the rear end o Mfg: Mesa Tactical Products, Inc.