Gunsmithing Threading the muzzle or chambering a barrel?

A-Rok

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Minuteman
Jul 15, 2010
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Seattle, WA
Hi folks,
I have a question about threading/crowning the muzzle of a rifle or chambering a new barrel. I've seen pictures of what looks like a precision ground pin that slides into the bore, and you indicate off of that as opposed to the outside diameter of the barrel. This makes sense to me, because the bore of the barrel may have a little bit of run out in relation to the outside diameter of the barrel.

Now, I've been looking for these pins for quite some time. Are there pins specially made for gunsmithing, or is it just a piece of precision ground rod?

Thanks,
-Rok
 

300sniper

Gunny Sergeant
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Minuteman
Jan 17, 2005
3,438
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Greenwood, Ca
Re: Threading the muzzle or chambering a barrel?

pacific tool and gauge makes them. they are called "range rods". they have a very shallow taper to them. a bushing sized to just fit in the bore is placed on the narrow end of the rod. the bushing is slipped into the bore until the taper bottoms out on the edge of the bore.
 

Hateca

Gunny Sergeant
Full Member
Minuteman
  • Aug 12, 2004
    1,567
    87
    Henderson NV
    Re: Threading the muzzle or chambering a barrel?

    "A little bit of run-out".

    There are barrels out there with more then just a little bit.

    Pacific Tool and Gage for all your barrel cutting needs.
     

    sudnrush

    Sergeant
    Full Member
    Minuteman
    Re: Threading the muzzle or chambering a barrel?

    Midwayusa.com also carries them indicator rods and range rods. you may need the different bushing sizes also.
    The one that comes with it I found was a little small for my factory Remington .308 barrel order the bushings from Pacific Tool and Gauge if you need them. You can buy just the ones you need or the whole set.

    Nathan
     

    eddieharren

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    Minuteman
    Aug 4, 2007
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    Ijamsville, Maryland
    Re: Threading the muzzle or chambering a barrel?

    Range rods are fine and available from PT&G as stated. I believe the precision ground pins, that the original poster was referring to, are known as deltronic pins. These are avilable in sets from MSC, McMaster-Carr etc.