I just recently bought a new STI dvc limited .40s&w. I cleaned and oiled gun before shooting. I test fired about 100 rounds through it before I took it to a match. During match it jammed like crazy. It double fed and failure to extract aN empty case. Also the slide felt tight to the frame. I removed the barrel and guiderod assembly and slid the slide back onto the frame and it locks up on the frame. At one point it locked up so hard while trying to remove the slide that I had to use a rubber mallet. If I keep lots of oil on slide it functions but having a lot of failure to extract. IT had about 300 rounds through it now. Any ideas? Or should I call STI and send it back?