![]() This is a known characteristic of modern pointed, non-expanding bullets. This characteristic is due to the fact that the projectile's center of gravity is towards the base of the bullet and upon impact the bullet yaws and the rear of the bullet rotates forward inducing tumbling. ![]() Properly stabilized in flight the fully jacketed projectiles of the 5.56 mm do in fact tumble, but upon impact. ![]() As noted above, the original AR-15 with the 1:14" twist was accurate at warmer temperatures but when the temperatures got below 40 degrees F the bullet did begin to tumble in flight and hitting a 100 yard target was problematical. If a bullet tumbles in flight it will be highly inaccurate and most likely not even hit a target. One of the persistent rumors about the M16 is that its bullet tumbles in flight. The rifling twist change DID NOT affect the lethality of the cartridge, contrary to the rumor mills. It took publication of tests by the National Rifle Association to get this noticed and the rifling was then changed to 1:12 and stability problems ceased. In spite of the manufacturer's hype to the contrary, at low temperature, most rounds would not stay on target at 100 yards. Unfortunately with this twist, the longer M193 FMJ-BT bullet was barely stable at normal temperatures and completely unstable below about 40 degrees F. Just like the venerated M1 Garand, M14, and the 1903 Springfield rifles (how some people forget) it had some initial teething problems.įirst, as originally introduced to the market the AR-15 had a conventional 1:14 twist barrel as that was the twist used in commercial. While it is not the wonder design some claim, it is not a useless piece of crap and it has been in continuous service around the world for close to 50 years and it is estimated that some 40 million M16s and AR variants have been made and used in some 80 countries. You can ignore these suggestions, but you do so at your own peril.Īccording to some "experts" the AR/M16 is the worst military firearm ever fielded (with perhaps the exception of the horrendous French Chauchat light machine gun of WW I). I make no claim that these are absolutes and or that I have discovered anything myself. This document has been prepared with input from numerous sources including Pat Rogers, Ed Harris, Colt Firearms, the Gunsite Alumni List, plus various professional armorers, and trainers too numerous to mention, and my friend Tom G., who edited and cleaned up my typos. The Armalite AR-15/M16 series of rifles has become one of the most popular military rifles ever built, but there are some tips and tricks that have been learned over the years that make owning and using them easier. (How to live happily with your AR platform Homeland Defense Rifle, as well as some arcane technical info) The Care and Feeding of the AR/M16 Platform Rifles The authors info is on page #4 post #34 to be exact. I am not a plagiarist nor am I intelligent enough to come up with this info on my own. I realize the post is long and people may not read to the end so I want to post this here also. Page #4 post # 35 acknowledges that I have no affiliation with the author or its contents. I found this link today and was impressed with the info so I am just sharing it with BCUSA. First thing I want to say is I can not take credit for any of this work.
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