I use the Canola oil also , leave the heat on for 30 minutes after bending - then cool overnight . One gun I had to bend 5 times , being inexperienced , and not wanting to bend too much at one time . It was springing back 50% , but on others had no springback . Michael , thanks for tip on being able to check springback while still hot , I thought any stock would spring back 100% if pressure was taken off right away . Paul