Here's the MadBull Airsoft SCAR Rail Extension reviewed by Desert Demon Airsoft... "We got the madbul airsoft PWS SRX a few days ago, we decided it would look great on ethans VFC Scar, and we were right. The Rail does not work on CA Scar-l, Dboys Scar-l, and Echo 1 Scar-l. The rails is made out of complete aluminum and weighs in at 1lb. it is 5 inches long to add a great look to your scar. Thanks for watching."