User talk:2600:8805:8100:1C:780F:9C78:1574:6352

Dreyse Needle Gun
"The rifle had a range of only 600 m (2,000 ft) and lacked the rubber breech seal that permitted aimed shots.[40]"

This needs some clarification as to why the lack of an effective breech seal might facilitate aim. There's a lot of potential effects; for example, gas leaking at the breech might disturb the shooter's aim or diminish velocity to the point that a high arc at range precludes accurate fire, but as written here there's no reason why the lack of a rubber breech seal - which should be referenced as a comparison to the Chassepot - should have anything to do with "aimed shots".

Harley-Davidson Shovelhead engine
"With the United States involved in the 1973 oil crisis, gasoline had a much lower octane and consistency that severely hurt the engine's performance."

The Cycle World online article cited does not substantiate this claim. Having lived through the 1973 oil crisis, gasoline octane ratings did not lower and high octane fuels were still available. Gasoline of all octane ratings was simply in short supply.