Before the Bolt Airsoft BR-47 EBB was released, the only way to have an airsoft SR-47 was purchasing the expensive Hurricane SR-47 kit. But there was an affordable kit that is available at Evike.com which is the Evike Custom SOCOM-47 Challenge Kit Receiver Set for M4 / M16 Airsoft AEG Rifles which you can get at a more afforable US$120.00 but does not come with the KAC markings.

Booligan Airsoft takes one of these kits to build an SR-47 AEG so watch and learn how Booligan was able to out one together... "This video is a long one because it's pretty much a complete build up on the Evike SOCOM-47 Challenge Kit. This kit was extremely rare and expensive in the airsoft scene, so it's nice to have an option available that's not terribly priced. I'm using a G&P 8mm ball bearing gearbox to power this little beauty, and full performance info will be in the full review on my website!"