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Old 06-22-2016, 12:49 PM
 
1,168 posts, read 676,810 times
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Quote:
Originally Posted by vicarjoe View Post
You can not simply screw on a barrel to the AR Upper receiver. There is a gauge for head spacing that has to be used so there is the correct distance between the bolt and breach. some say they self head space but its a bit of a flip of a coin if you just put a barrel on an ar upper.
??Really?

We are talking AR-15 right?

So when you find out it is off, what exactly do you do to it. Grind the bolt down?

AR's dont require any head spacing unless you are actually making the barrels and barrel extension. Even then if you make the parts to spec it is not necessary.

The tolerance of the bolt lugs is .278 +- .002. If there is less clearance the bolt wont rotate in the barrel extension and the firing pin wont reach the primer. If there is more clearance the bolt will sit too deep on the barrel extension and the firing pin wont reach the primer. Either way if you are out of spec the rifle wont fire. Period.

The military uses go go go gauges for checking condition then if they exceed wear they toss the barrel or bolt or both.
This is one of the great design Ideas of the AR making it so flexible and useful.
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Old 06-22-2016, 09:50 PM
 
Location: Texas
5,586 posts, read 11,856,572 times
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^^Exactly as Joe states. The only way to have a rifle with excessive headspace is if the bolt is extremely worn or it was made wrong. I've never seen an AR ever fail any headspace gauges. If you ever get the opportunity to build one, you'll see that the barrel bolts up to the receiver and there is zero adjustment. Torque between 60-80lbs to provide the right index for the gas tube if using a free floating forearm and you're done. Here's how it all goes together. Note how the barrel is attached.

https://www.youtube.com/watch?v=rxylroMyQ2A
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Old 06-28-2016, 04:39 PM
 
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Always easy to see who DOESN'T have experience with AR's when they start talking about headspace. . .
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Old 06-28-2016, 04:47 PM
 
1,168 posts, read 676,810 times
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Quote:
Originally Posted by TaxPhd View Post
Always easy to see who DOESN'T have experience with AR's when they start talking about headspace. . .

That being said there ARE a remarkable amount of head space gages being advertised for sale...
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Old 06-28-2016, 04:52 PM
 
5,221 posts, read 2,381,873 times
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Quote:
Originally Posted by Joe33 View Post
That being said there ARE a remarkable amount of head space gages being advertised for sale...
Gauges are nice to see if it is in fact properly headspaced, but they aren't necessary, and unlike a bolt action rifle, there isn't really anything that you can do about incorrect headspace, other than swapping barrels or bolts.

I've put a few together, and have never had one that didn't properly headspace.
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