[E92Gok]

So this may be a noob question but I was hoping somebody would have a answer for me. I own a 2008 e92 m3 6mt. My problem with my car is when driving and downshifting from 3rd to 2nd gear and rev match the car it doesn't let me pop it into 2nd and makes this almost odd "grinding" noise. I personally think I am rev matching and downshifting properly but I may be wrong. I was just hoping somebody would know what it may be from. The way I downshift just to clarify is clutch in, blip throttle, select gear, catch with clutch. From what I've read I may just have bad synchro's.

Thanks in advanced!!