If its an AEG, it will use TM compatible RIS/RAS systems. Ill link a few places to get em.
http://airsoftdepot.ca/catalog/index.php?cPath=22_36
http://www.airsoftparts.ca/store2/in...ex&cPath=65_85
Note: only GBB use the real style delta rings. If you have a gun with a real style delta ring, you can only use Real Steel RAS systems.. or ones made for GBBR's.