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Posted: 9/20/2004 8:51:26 AM EDT
[#1]
Problem would be incorrect heat treating/finishing. Sounds like you all got bolts from the same batch.
Best bet would be to find a new supplier that would have a different batch of bolts, and may not that the brittle defect. |
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Posted: 9/20/2004 11:33:30 AM EDT
[#2]
Whose bolt? Some have their bolt faces open after heat treat and don't work so well.
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Posted: 9/20/2004 1:49:09 PM EDT
[#3]
Could also be a bad barrel. I kept blowing extractors on mine until I found out the bolt would not close on a go gauge.
Changed barrels and problem solved. |
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Posted: 9/21/2004 5:50:36 AM EDT
[#4]
Hiya Plate -
Check your headspace, I had a 5.56 AR that broke two, come to find out the bolt closed on a NOGO guage. The barrel extension was cocked on the barrel, and the bolt lugs were not all engaging the lugs in the barrel extension. It is either this, or the bolts are improperly hardened. Ops |
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Posted: 9/21/2004 2:52:54 PM EDT
[#5]
deep HS will not result in cracked bolts as deep HS lowers chamber pressure. It's normal for properly HS'd barrels to close on the civilian NOGO gage.
Short (sub GO) HS drives up chamber pressure and can contribute to bolt wear. Bolt's shouldn't fail in inside of 10k rounds, period. |
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Posted: 9/22/2004 2:35:46 AM EDT
[#6]
Thanks for your replies, I sent the bolt back to the supplier who told me it has a lifetime warranty. If I get another failure, I will send the upper back. I don't have any headspace gauges for 762X39, so I will let them check it if need be. I don't know if there is much pressure difference in 762X39 amd 223. Maybe the rifle in that caliber needs to be re engineered to have the service life that the 223 has.
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Posted: 9/22/2004 2:59:49 AM EDT
[#7]
Chamber pressure in 7.62WP is significantly lower than in 5.56 due to the larger bore diameter.
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Posted: 9/22/2004 5:09:15 AM EDT
[#8]
Thanks Tweak, That answers that question for me.
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