21. He had threatened a flight attendant with an air gun . 22. In medical literature, modern air guns have been noted as the cause of death. 23. The celebrated Lewis and Clark Expedition ( 1804 ) carried a reservoir air gun . 24. He designed various rifles, including air guns and sporting firearms. 25. These fortifications were modified as artillery technology developed, making fixed open-air gun emplacements untenable. 26. First, try the hot-air gun ; it just might soften the paint enough for scraping. 27. The guns are essentially modified air guns which shoot liquid-filled gelatin capsules, or balls. 28. A hot air gun will soften the varnish so you can pick it out. 29. A hot-air gun is too hot for safe use indoors. 30. John Oster deeply regrets the incident but this highlights the danger of air guns .