The ACE Interface to Picatinny Rail adapter allows the userto add the ACE Two-Screw Interface to firearms with a picatinny rail on thereceiver. With this adapter, you can add any ACE folding mechanism and/ orstock to your picatinny railed firearm. Machined from 6061 billet aluminum, theACE to Picatinny Rail adapter is durable and ready for all conditions.