C-90 (esteemed smartass of #gunblogger_conspiracy) has a challenge for you. Listen to the audio files below and try to identify what firearm each one is, just by hearing the action cycled.
Action 1
Action 2
Action 3
Action 4
I'll post answers whenever C-90 give's em up. probably in about a week. So far I've gotten one right. How many can you get?