Shot match last weekend using my 33 round Glock mag with TF extension. I've been using this setup for several matches with no issues. I normally make ready by locking back the slide, pushing mag in, and releasing slide with mag release to chamber the round. Last week on the first stage, the round did not strip from the mag. Pulled trigger, no bang, checked that mag was seated, seemed to be, racked slide and everything worked. Is is possible that the mag was at an unfavorable angle causing the problem?