The Picatinny adapter is 2-piece, with one that inserts in to the rear dovetail and also a rail that screws down into it. The hardware was smooth and wholly unsatisfactory, so we changed them with some Quality eight equipment screws. The Roni offers A LOT a lot more rail space! https://recover-20-2007395.worldblogged.com/32627373/recover-20-20-an-overview