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January 3, 2015

Weaponsman lays down on making/adapting rifling machines.  It appears easier than I was seeing the last time I looked at it, but still complicated, especially if you want to make lots of barrels.  You still need to gun drill though, and that’s not fun.

Drills and the difficulty of drilling a hole is generally determined by the ratio of the diameter to the depth.  Per a manufacturer, gun drilling is typically used when the ratio exceeds 20:1, and can work up to 400:1.  For a .223″ hole, that would be 4.46″ to 89.2″  I doubt many people will be putting an 89″ barrel on an AR, so you can see the advantage.  It uses a special straight flute bit, not all lathes can feed slow enough to run one, and you need a high pressure coolant feed.

Be wonderful to get a post by someone who’s done it, to get a proper laydown of what’s needed.


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  1. What do you mean layout?
    My brother is a machinist/tool and die maker,he’s used gun drills for years-not for making gun barrels- for making some of the specialty tools the company he works for makes. The process is exactly the same though,we have discussed it in depth in the past.
    It ain’t easy,and the set-up has to be 100% perfect.
    I’ll see if I can get him to post here,and tell you what you want to know.

  2. Haven’t forgot about you-just a lot going on,and haven’t talked to my brother for a few days,we went hunting Sun. and he said he was in the process of writing the steps and procedures down.

  3. I just got my NRA summer gunsmithing class schedule. It’s not up the schools sight yet and you could contact 530-257-6181 ext 8910 and ask them for a copy.
    There are 2 class’s offered this year in barrelling
    Basic Barreling – threading, chamber, headspacing
    Advanced Barreling – specfic tech’s in mfg of barrels

    I don’t know where you are but the NRA sumer gunsmithing classes offered in a number of places accross the US –

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