tag:blogger.com,1999:blog-143925273655347334.post2289131901273604438..comments2024-03-27T07:30:02.390+00:00Comments on drsolly: School shooting sheltersdrsollyhttp://www.blogger.com/profile/15954188290191548178noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-143925273655347334.post-53377222747869350932018-03-05T07:43:14.386+00:002018-03-05T07:43:14.386+00:00The AR15 uses a small calibre bullet with an unsta...The AR15 uses a small calibre bullet with an unstable spin, just enough to keep it pointed forward during flight through temperate air (arctic models of the rifle are made with extra twist in the rifling to compensate for increased density of cold air). The bullet instantly tumbles when it hits anything material. This is very effective when it hits its intended target, but if it encounters any obstruction, even foliage, before finding its target, its energy is dissipated. This proved to be a significant drawback in jungle warfare. Anonymousnoreply@blogger.com