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6/11/2006 11:35:39 PM EDT
do you know if the ammunition velocity of xm193 increases by only 9 fps between 18" and 20"?


www.ar15.com/forums/topic.html?b=2&f=134&t=149575
6/13/2006 1:50:33 AM EDT
[#1]
has anyone tested an 18" barrel on a ruger mini-14 against a 20" barrel of an ar-15?
then we would know.
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