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Foldable and flippable adapter devices, apparatus, systems and methods of attaching accessories, such as grips and lights to firearms. Adapters can include a slidable thumb switch for locking a swinging plate with side rails to a main plate, and spring loaded detents for locking the swinging plate i

Foldable and flippable adapter devices, apparatus, systems and methods of attaching accessories, such as grips and lights to firearms. Adapters can include a slidable thumb switch for locking a swinging plate with side rails to a main plate, and spring loaded detents for locking the swinging plate in substantially vertical orientations. A folding rail adapter can be substituted for the existing rail system on firearms to allow the rail to be directly attached to the firearm. A flipping rail adapter can have a pivotal lever which supports a folding rail in an open position. Springably biased detent pins allow the lever to lock open. Pushing the lever back will overcome the springs so that the pins can pass out of the detents allowing the folding rail to move to a folded position.

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1. An adapter for mounting accessories to firearms, comprising: an adapter member having an upper side and a lower side;a clamp on the upper side of the adapter member for allowing the member to be attached to a firearm;a swing plate pivotally attached to the lower side of the adapter member, the sw

1. An adapter for mounting accessories to firearms, comprising: an adapter member having an upper side and a lower side;a clamp on the upper side of the adapter member for allowing the member to be attached to a firearm;a swing plate pivotally attached to the lower side of the adapter member, the swing plate having picatinny side edges for supporting an accessory;a lever for holding the swing plate in an open position; anda switch allowing the swing plate to be released from a locked position to be able to rotate to the open position, wherein the lever has a free end protruding from the adapter assembly that is adaptable for a user to move the lever. 2. The adapter of claim 1, wherein the switch includes: a spring for biasing the lever to a locked position. 3. The adapter of claim 1, further comprising: a catch on a free end of the swing plate for catching onto a protruding end on the switch, so that the swinging plate is held in the locked position. 4. The adapter of claim 1, further comprising: a longitudinal slot down the lower side of the adapter member, the longitudinal slot for allowing a portion of the lever to rest therein when the swinging plate is in the locked closed position. 5. A method of mounting and using a foldable accessory mounting plate to a firearm, comprising the steps of: clamping upper sides of a top plate member about picatinny rails on a firearm;pivotally attaching one end of a bottom plate member to the top plate member;pivotally attaching a lever between the top plate member and the bottom plate member;folding the bottom plate member into a folded position by pivoting the top plate member relative to the bottom plate member, and pivoting the lever between the top plate member and the bottom plate member; andlocking the bottom plate member into an open position by a switch, which allows for the bottom plate member to pivot relative to the top plate member, and allows for the lever to pivot between the bottom plate member and the top plate member; andbiasing a detent pin into a detent surface to lock the bottom plate in the open position. 6. The method of claim 5, wherein the locking step further includes the step of: biasing the detent pin into the detent surface by a spring. 7. The method of claim 6, further comprising the steps of: pressing a first detent pin into a first detent surface on a side of the lever to lock the bottom plate member into the open position; andpressing a second detent pin into a second detent surface on another side of the lever to lock the bottom plate member into the open position. 8. The method of claim 7, further comprising the step of: biasing the first detent pin into the first detent surface by a first spring; andbiasing the second detent pin into the second detent surface by a second spring. 9. The method of claim 5, further comprising the step of: providing a longitudinal slot down the lower side of the adapter member; andresting a portion of the lever into the longitudinal slot when the swinging plate is in the locked position. 10. An adapter for mounting accessories to firearms, comprising: an adapter member having an upper side and a lower side;a clamp on the upper side of the adapter member for allowing the member to be attached to a firearm;a swing plate pivotally attached to the lower side of the adapter member, the swing plate having picatinny side edges for supporting an accessory thereon;a moveable member for holding the swing plate from an open position to a locked position;a detent surface on the moveable member;a moveable detent pin having an end for being pushed into the detent surface; anda switch for allowing the swing plate to be released from the locked position to move to the open position. 11. The adapter of claim 10, further comprising: a spring for moving the detent pin into the lock position. 12. The adapter of claim 10, further comprising: a second detent surface on the moveable member; anda second moveable detent pin forming a second lock position with an end of the second detent pin pressed into the second detent surface. 13. The adapter of claim 12, further comprising: a first spring for biasing the first detent pin into the first lock position; anda second spring for biasing the second detent pin into the second lock position.