Sometimes your gun malfunctions...here are the most common:

• Misfire: you hear a click instead of a bang...tap, rack, bang!
• Stove-pipe: an ejection problem where you see a stuck spent casing...tap, rack, bang!
• Double-feed: one round is trying to go into an already occupied chamber...lock the slide back, drop the magazine, rack three times, put a new magazine in, rack and bang!