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Twist Rate

Old 02-23-2015, 06:26 PM
Nontypical Buck
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Talking Twist Rate

So I won a Stag AR-15 Model 2 from the NRA yesterday. I have never owned an AR before and know very little about them. Never the less, I'm super excited. But I have been doing some reserch and am wondering what twist rate means. The twist rate is 1/9th button rifled. Its a .223/5.56

Last edited by stuckinthereeds; 02-23-2015 at 06:39 PM. Reason: more information given.
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Old 02-23-2015, 06:55 PM
Nontypical Buck
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it'll probably shoot anything up to 70 grain bullets well, its one turn in 9 inches of barrel
here is the formula to determine bullet rpm
MV x (12/twist rate in inches) x 60 = Bullet RPM
so your shooting a 60 gr. bullet at 3100 fp
3100x(12/9=1.333) x 60=247,938 rpm's
should shoot any weight bullet well from 45 to 70 gr. as long as the bullets jacket can withstand the rpm's
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Old 02-23-2015, 08:44 PM
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Ridge explained it is some additional information;
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Old 02-23-2015, 10:14 PM
Nontypical Buck
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You are lucky! I wish that they weren't so anal about anything resembling military here.
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Old 02-24-2015, 06:42 AM
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Originally Posted by redgreen
You are lucky! I wish that they weren't so anal about anything resembling military here.
Yeah... As fun as my Canadian buddies have tended to be, I just can't get over that communist crap - I like my handguns and AR's way too much!!

Wait... Let me rephrase myself...

I like my RIGHTS too much...
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