Strike Industries have some rail mounts and a QD sling swivel which are now out:
NOW AVAILABLE From Strike Industries:
Dura Mount Series Sling Adapters
Features
* Aluminum T6 6061 metal construction
* Matte black finish
* Steel mounting screw
* Fits Picatinny MIL-STD-1913 rails
* Slim profile designMore info: [here]