Engineerable gives a quick view of a Cheap Quick Release for use on Picatinny rails for airsoft and gel blasters... "This is a quick release for picatinny tactical rail compatible accessories. Instead of using screws to tighten the accessories on the rail, this has a quick release lever."

A quick video from Laylax showing their Nitro.Vo Quick Release Kit for those who need a high mount for their rails.