1. AR7 Went full-auto after the first two shots!
2. S&W M&P9c Was my first single shot semi-auto. Factory fixed it, but didn't trust it!
3. Charter Arms Bulldog. The internals must be stamped out of Coke Cans. You could rotate the cylinder by hand when in full lock-up.
4. Taurus 44 Special. Factory bored 3 cylinders for 44, not sure about the other two, but a 44 wouldn't fit!