GO NO-GO gauge question.

870supermag

870supermag

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So i have a ar style rifle and i re barreled it. I tested with my go no go gauge when i first installed and it was good. I was just screwing around with the gun and re tested and if i push hard i can get the no go to lock up. Now i dont know if i just didnt try to push that hard the first time or what. So it takes like 3-4 times the force to get it to lock up. I have fired a few hundred rounds through the gun with no issue.

Should i be concerned ???
 
Do you plan on reloading the fired brass? Size accordingly... don't push the shoulder way back...

If you are shooting only factory loads I would not worry... you are only off a perfect head space by 2 thou.
 
I will be reloeading i full length all my brass. Its pretty tight to get it to close and i have to use a dowel in the bottom of the bolt to get it to release.
 
870supermag said:
I will be reloeading i full length all my brass. Its pretty tight to get it to close and i have to use a dowel in the bottom of the bolt to get it to release.
Click to expand...

Listen to guntech. I've seen factory rifles with slightly over max headspace and they not only function fine but accuracy is good. Zero issues
 
Don't push hard to make a rifle close on a gauge. If the action doesn't quite close with gentle pressure, and you can FEEL the gauge, it is correct. I doubt very much that you have a problem, unless you created one by forcing the action shut on a hardened steel gauge.
 
Its a ar style rifle so its just my thumb that is pushing the bolt home so i dont think there will be any damage. Good to know it dosnt need that much pressure to be conciderd good.
 
I’m not a gun smith.
And I’ll assume an AR styled rifle is an AR.
I recently swapped a barrel on a 783
I was under the impression to set headspace one should;
-remove the ejector and extractor from the bolt head.
-drop in the go gage, spin the barrel into the receiver to zero play with the bolt in lock up (lightly, it’s a feel thing)and torque the barrel nut.
-drop in the no go gage and the bolt should not close, again it’s a feel thing (I believe the difference from a go to a no go is .005”).
Doing this worked out great for me.
On the AR the barrel extension is usually set at the manufacturer and locked in place by the index pin so your more checking than setting (unless you have a multitude of bolt heads to try).
If you’ve touched off several hundred rounds and have to apply force to close on a no go gage I doubt you have an issue but I would think if you are worried about it you could measure a fired case.
 
Measuring a fired case on a self loader ‘might’ be misleading as there is evidence that the rapid and forceful extraction of a case from the chamber after firing can stretch the case
 
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