m2pro Alabama Fan Member since Nov 2008 19600 posts Online
re: Official AR-15 thread(Posted by m2pro on 1/18/13 at 11:51 am to JD10)
btw, i think the RR has the 1:7 twist that helps stabilize bullets for accuracy at a larger range with a higher grain. the rest of those have a 1:9 twist i believe. which is "worse." but all of those are fine guns.