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Posted: 4/27/2015 12:11:55 PM EDT
Hi all, I'm new to the forum but was an armorer in the Army 30 years ago so I'm not new to the AR platform. Does anyone have the drawings or dimensions for go and no-go headspace gauges for 300 BLK? I'd like to make my own and save $70.
Link Posted: 4/27/2015 3:24:28 PM EDT
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.
Link Posted: 4/27/2015 3:39:37 PM EDT
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Originally Posted By mizzarley:
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.
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Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.
Link Posted: 4/27/2015 4:07:38 PM EDT
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Originally Posted By roostonu:

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.
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Originally Posted By roostonu:
Originally Posted By mizzarley:
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.

http://www.saami.org/PubResources/CC_Drawings/C%20and%20C%20Dwgs%20-%20TOC%20-%20Rifle.pdf
Link Posted: 4/27/2015 4:13:46 PM EDT
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Originally Posted By roostonu:

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.
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Originally Posted By roostonu:
Originally Posted By mizzarley:
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.

Try posting this sort of thing in the technical forums next time. You'll get a little less "you don't need to do that" and a little more "here's how ya do that".
Link Posted: 4/27/2015 4:24:37 PM EDT
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Originally Posted By lysanderxiii:

http://www.saami.org/PubResources/CC_Drawings/C%20and%20C%20Dwgs%20-%20TOC%20-%20Rifle.pdf
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Originally Posted By lysanderxiii:
Originally Posted By roostonu:
Originally Posted By mizzarley:
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.

http://www.saami.org/PubResources/CC_Drawings/C%20and%20C%20Dwgs%20-%20TOC%20-%20Rifle.pdf

Thanks, I have that already but it doesn't help with the gauges.
Link Posted: 4/27/2015 4:25:08 PM EDT
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Originally Posted By BlackRifleJuju:

Try posting this sort of thing in the technical forums next time. You'll get a little less "you don't need to do that" and a little more "here's how ya do that".
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Originally Posted By BlackRifleJuju:
Originally Posted By roostonu:
Originally Posted By mizzarley:
Are you talking a 300blk AR? If so, no need for headspacing if your barrel was made by a reputable manufacturer. Just like 5.56, the headspace is set when the barrel extension is installed at the factory.

Yes, and that is why I asked in an AR15 forum, as well as mentioned my familiarity with the AR platform but sorry for the confusion. Please note as well, that I did not ask if I need to check the headspace. Just hoping to make my own gauges. Equipment, capabilities and tolerances are not in question here either.

Try posting this sort of thing in the technical forums next time. You'll get a little less "you don't need to do that" and a little more "here's how ya do that".

Good idea, thanks.
Link Posted: 4/27/2015 7:00:51 PM EDT
New here also, lots of great info.
Link Posted: 4/28/2015 1:28:55 PM EDT
[Last Edit: 4/28/2015 1:34:24 PM EDT by Yelpers]
Seems complicated. I would imagine your gauges would be slightly smaller than a chamber by .005" according to the spec.

Assuming I'm reading this correctly (never tried before), your maximum length would be 1.0818" measured from the base to .3512" diameter on the 23 degree shoulder. And the minimum would be 1.0748" at the same point. Probably be easier with actual gauge prints. Kind of interesting. What are field gauges like .012" over min?

Link Posted: 4/28/2015 2:41:23 PM EDT
Welcome aboard
Link Posted: 4/29/2015 5:06:15 AM EDT
Link Posted: 5/3/2015 11:36:54 PM EDT
Hey all,
im new to the AR scene. just picked up my first AR-15. Trying to learn more about optics/ammo/ etc. Im familiar with handguns and what not but this rifle business is all new to me.
just wanted to say hey!
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