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.:barmy: 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

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
RR

Ridge explained it well..........here is some additional information;

http://www.gunnersden.com/index.htm....ist-rates.html

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...