Shop › MESA 20GA TO 12GA STK ADAPTER REM870 MESA 20GA TO 12GA STK ADAPTER REM870 $24.95 Mesa Tactical Lucy Stock Adapter, Fits Remington 870 12 Gauge, 20 Gauge to 12 Gauge Stock Adapter, Black 93890 Quantity: Add To Cart Added! Mesa Tactical Lucy Stock Adapter, Fits Remington 870 12 Gauge, 20 Gauge to 12 Gauge Stock Adapter, Black 93890