Called the Lucy adapter, this elegantly simple coupler
simply bolts to the back of a 20 gauge 870 receiver, allowing the 12 gauge
stock to then rigidly bolt to the adapter. This greatly increases the options
and availability of butt stocks for the 20 gauge shotgun.
Mesa Tactical’s 20 gauge to 12 gauge adapter dramatically
increases the number and type of butt stocks that can be used with 20 gauge
Remington 870 shotguns. Attached at the receiver in place of the standard 20
gauge stock, this cast steel adapter enables the use of any 12 gauge Remington
870 stock. There are many more options for the 12 gauge than 20 gauge,
including Mesa Tactical’s Urbino Stocks, telescoping stock adapter kits and
even the Hydraulic Buffer system.