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Where can I find a Headspace gauge?


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#1 OFFLINE   USMC2111

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Posted Feb. 23 2010 - 02:08 PM

Where can I find a headspace gauge?

Will the same gauge work for 5.56, .223 and .223 wylde?.... anybody know?


#2 OFFLINE   GUNMAN556

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Posted Feb. 23 2010 - 02:11 PM

You can get them at Brownells.


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#3 OFFLINE   SSGN_Doc

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Posted Feb. 23 2010 - 03:18 PM

.223 and 5.56 are different.


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#4 OFFLINE   dupa220

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Posted Feb. 23 2010 - 03:31 PM

.223 and 5.56 are different.

I just got one from Brownell's and it says 5.56 .Then it says it's to the "Colt special "Feild" guage dia Colt 5.56 (.223) oops???? Then it says it's a special Colt "Field " gauge dia of 1.4736" Should be GTG.

Edited by dupa220, Feb. 24 2010 - 08:26 PM.



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#5 OFFLINE   USMC2111

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Posted Feb. 23 2010 - 04:52 PM

I know the diffference between a "go" and "no go"...but what is a" field"?


#6 OFFLINE   dupa220

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Posted Feb. 23 2010 - 04:59 PM

I know the diffference between a "go" and "no go"...but what is a" field"?

It is a GO/NO GO gauge. Their just saying it's machined to Colts "Field" gauge dimension of 1.4736". Brownell's is saying the Colt "Field" gauge allows "maximum acceptable headspace on the AR-15" qouted right from their pamplet that came with the gauge.The gauge is ground to Colt spec's.
Hope I didn't make that too confusing. :thumb:


#7 OFFLINE   mudbug

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Posted Feb. 24 2010 - 07:48 PM

so would that gauge also distinguish wheather or not a barrel will accept 5.56? have a bud with a heavy barrel on a rra he bought used, no markings anywhere in barrel and there is some concern over weather or not it's original. don't want him destroying it by feedin it some 5.56.


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#8 OFFLINE   Frac

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Posted Feb. 25 2010 - 11:56 AM

The cartridges headspace off of the shoulder. The headspace gauge is just checking the headspace dimension, not any of the others. I wouldn't use one solely to check the chambering. I would recommend sending it out to Adco for service. They could ream it out to a true 5.56.

Edited to add: The 5.56 chamber specifies a longer throat, which is one of the reasons why you don't shoot 5.56 in a .223 rem chamber. The headspace gauge doesn't check the throat at all.

Edited by Frac, Feb. 25 2010 - 11:59 AM.



#9 OFFLINE   disccop75

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Posted Apr. 02 2010 - 10:25 PM

Ahhhhh. I don't get it.





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