jsmythe Posted March 23, 2011 Report Share Posted March 23, 2011 ok this maybe a stupid question, but I will put it to you anyways. How much of a noticeable difference does the barrel length from 16", 18", and 20" have on a semi auto .308? what difference does it make at all (other than length)? Quote Link to comment Share on other sites More sharing options...
TANGO2072 Posted March 23, 2011 Report Share Posted March 23, 2011 Hey J1st off I hope you're asking this in the AR-10 ( Armalite ) cuase you have decided to get the BEST.What differences are you reffering to ?speaking from experience, I had a stock 20", had it cut down to 18" thanx to the guys over at ADCO. Ballistically; if you shoot Black Hills 168g BTHP, you should be averaging 2650fps, from a 20", I chrono'd mine a couple of months ago and found to have only lost ruffly that 50fps from an average of 8-rounds fired.My AR, kinda likes 168, but I've found she LOVES 175. I have been shooting my best groups w/ it, lately and have rezero'd for that only. I'll hold off for anything else I'd need to shoot.So unless you're running MOUT / CQB drill, the barrel length, until you go 24+"there's not much noticable diff.Hope this lends some insight. Quote Link to comment Share on other sites More sharing options...
RayGun19 Posted May 18, 2011 Report Share Posted May 18, 2011 I have a 16" on mine, with an AAC muzzle brake. I was more concerned about length, and new the range would be affected slightly over a 20" barrel. But, as I have a long rifle for out to 1000m, I wasn't too worried about that. If the zombies ever rise, I know I have the ballistic energy out to 4-500m with my AR10, and beyond that with the long rifle. <thumbsup> Quote Link to comment Share on other sites More sharing options...
survivalshop Posted May 19, 2011 Report Share Posted May 19, 2011 Look at my post ,down the page a little & you can see the difference between a 20" & 16 " in FPS.http://308ar.com/forum/index.php/topic,447.msg7139.html#msg7139 Quote Link to comment Share on other sites More sharing options...
RayGun19 Posted May 20, 2011 Report Share Posted May 20, 2011 That's not enough to even worry about! I'm also interested that the heavier 175gn bullet did better than a 168gn bullets. Heavier is always better (or worse for the guy on the receiving end.) LOL Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.