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Message: <blockquote data-quote="Ralts Bloodthorne" data-source="post: 2743435" data-attributes="member: 6390">It's called recoil, which is why there are stocks, and why the blowback mechanism and recoil springs exist in rifle, as well as why the pistol grib is shaped in such a way and the blowback design is the way it is. Remember, older pistols (which delivered far less kinetic energy) would cause major recoil, enough to throw one's arm up.Other reasons while a lot of people think that Newton's expalins it don't realize that most heavy weapons, from assault rifles to sniper rifles to heavy machine guns, have recoil springs to help dampen the recoil force and bleed it off. I do know that a bad recoil spring in an M-16A1 will give the firer a broken shoulder.Plus, if you just say: "Newton's Third Law" you aren't taking into account that a hard punch from a trained fighter will actually lift you up and toss you back, or knock you flat on your butt, and a punch delivers a LOT less kinetic energy than a pistol round. Why didn't the fighter end up on his back?The More You Know...Now, since that was half sarcastic, I will admit, it started making me curious. So I went and looked up various medical and field reports...When I was hit, it knocked me off the back of the truck. It also hit with enough force to pop one of my ribs.Here's the weird thing, while Mythbuster's claims it was a myth, and the guy who created the Second Chance vest shot himself in the chest while on one foot, there has to be some reason that some people are "tossed back" about a foot or two (No, not flying through the air for 50 feet) or thrown to the side (it's hard to explain) while other people just jerk and drop.Some of it might be muscle spasm/nerve shock, final muscle spasms, etc.Having not seen the Mythbuster's in question, and only going off of first person observations, I'm still convinced that there is signifigant knockback (IE: less than 2 foot, although it seems like your airborne for a LOOOONG time if your the one shot) in the case of armored vests.Huh....The More I Know...   <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin    :D"  data-smilie="8"data-shortname=":D" /></blockquote>

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