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User Panel
User Panel
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Posted: 8/21/2006 3:42:11 PM EDT
[#1]
Honestly, I don't know, but the location of the index pin has to be 180 degrees opposite of the center of the feed ramps on the barrel extension. So it's either pre-drilled, or he's gonna have to drill it exactly where it wasn't pre-drilled.
My money is on, yes it's pre-drilled. |
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Posted: 8/21/2006 4:20:51 PM EDT
[#2]
Randall from AR15Barrels.com has an excellent write up on how he does barrels. It includes a reference to the barrel extensions. You may want to contact him or visit his site. He is a nice guy to deal with, and is the person I will go to when I go to do a 6.8SPC build.
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Posted: 8/21/2006 5:32:52 PM EDT
[#3]
I was able to find a pic. that shows it pre-drilled. Any one know the torque spec? Thanks for the help.
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Posted: 8/21/2006 5:40:21 PM EDT
[#4]
KABOOM!
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Posted: 8/21/2006 5:43:08 PM EDT
[#5]
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Posted: 8/21/2006 7:11:21 PM EDT
[#6]
150 foot pounds for the extension. Pin hole and feedramps are milled and drilled when the extension is made, keeps them in line. Once the extension is spun on to proper torque and headspaces within spec, then the gas hole is drilled in line with the extension pin. |
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Posted: 8/22/2006 8:01:40 AM EDT
[#7]
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Posted: 8/22/2006 11:14:36 AM EDT
[#8]
0.620" is the spec, but you can often get away with 0.625" up to about 0.628". It really depends on your bolt lug length. When chambering, set the rear of the "go" headspace gauge 0.750" from the barrel torque shoulder and you should be good to go. As already mentioned, the pin hole is drilled in the extension as they come from the factory. The feedramps are also there. Everything else with critical indexing (port, FSB etc...) on the barrel is done AFTER the extension gets installed. More fun on my barrel making page |
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Posted: 8/22/2006 11:31:17 AM EDT
[#9]
And POST PICS!!! |
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Posted: 8/22/2006 11:38:51 AM EDT
[#10]
Like this? 
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Posted: 8/22/2006 11:40:44 AM EDT
[#11]
NO! When he blows the gun to bits! Carnage Photos! |
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Posted: 8/22/2006 11:58:58 AM EDT
[#12]
Mr. Rausch, Thank you very much. Thats is what I needed. I have been to your web site
many times to read, learn and drool. Thank you again. |
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Do you know how long the barrel stub is from the shoulder to the end of barrel (chamber). I know the thread is .8125"-16UNF thread. Just need to know how long.