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You asked for it, so here it is.  Part 3 of our barrel discussions with Faxon.  In this one we jump into twist rates, stress relief, lead lapping, break-in, gas ports and more.  

00:41:11   Deep dive on twist rates.

    How are they determined?

    How are twist rates made?

    What is ideal for my caliber / bullet?

    What is twist rate?

    55 grain bullets in a 1/7?

    How is twist rate cut into a barrel?

20:46:00  Stress relieving

   What is “Stress”

   What to look for in properly stress relieved barrels.

   Methods of Stress Relief (Thermal vs. Cryo)

   Discussion on Cryo treatment in general

   How do you know stress relieving worked?

28:35:00  How good were the best barrels from “old times” when compared to  the modern era?

31:16:00  What is lead lapping?

32:52:00  Discussion about barrel “break-in”

   What is it & what does it do when they break-in a barrel?

   What about treated barrels like Nitride and Chrome?

   Barrel break-in for average shooters compared to niche need       shooters like bench rest competitors?

43:45:00  Gas port sizes and barrel location?

   Rifle length, mid length, carbine length?

   Gas port cutting location, between or on lands and grooves?

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Comments

Sidney Reilley

Great job guys, you even brought up some issues I had forgotten about (the fire lapping bullet kits )

Sidney Reilley

As a follow up, perhaps next time you could go into bore cleaning processes and products, real alchemy.

michael bujnarowski

next one should include how often chrome and nitride barrels should be cleaned. would love to hear what a barrel manufacturer say about it

Andrew MacDougall

You'll be happy to know I just bought a faxon barrel + GB for my new build thanks to this series.

Nathan K.

55 grain... 1:7... benchrest... overstabilized... #triggered. But in all seriousness, great discussion. I now have a much better idea what to look for in my next build, for *my specific* application. Great to hear the opinion of wizened folks on that matter.

Gustavo Cerezo

Awesome stuff. FWIW, I shoot olympic style smallbore (.22 LR subsonics in 26-ish inch barrels) and I don't know of anyone who breaks their barrels in. It's just known that it will take about a thounsand rounds (two or three day's worth of training if you compete at a high level) to get the best groups and then you have quarter-inch groups at 50 meters for about 10 to 30 thousand rounds. If you can (not my case) one should have a barrelled action for training (and keep it for 100 or 150 K rounds) and another one for competition.

Tony Bouza

What I wonder is, does using a .22 conversion kit reduce/help the accuracy of the AR?

Derek Martin

Great content guys! These tech videos are great and no one else seems to do them with so much real practical information.

Eric Fusco

You guys are the best for real deal breakdowns and in depth gun knowlege. I am so excited for the Ar series. Thanks for coming at it from a historical perspective and not just, "Hey this is new and tacticool! Buy it!".

D Lewis

Interesting that you talked about TnArmsCo in this podcast, I actually just finished a build using their lower and I had major issues. I left them a bad review and posted on Reddit about it after their customer support has ignored me for a week. Here is my Reddit post: <a href="https://www.reddit.com/r/ar15/comments/67cycq/tennessee_arms_co_polymer_lowers_dont_buy_follow/" rel="nofollow noopener" target="_blank">https://www.reddit.com/r/ar15/comments/67cycq/tennessee_arms_co_polymer_lowers_dont_buy_follow/</a>