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Posted: 6/14/2010 1:24:34 PM EDT
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Ok, I just put my first build together. Everything seemed fine. I tested it with all 3 gauges:
Go NoGo Field Guess what, it closed and dry fired on all 3. Is that right? I thought that it should have not closed and fired on the NoGo, but it is my first build, and any advice is gratefully accepted. Thanks Dan |
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I would say the easiest way to check would be...
1. Drop in GO gauge and close the bolt. 2. Take a grease pencil and make a mark on the front of the carrier at the ejection port. 3. Remove GO gauge. 4. Drop in NO GO gauge and close the bolt. 5. Repeat step 2. 6. Remove NO GO gauge. 7. Drop in FIELD gauge and close the bolt. 8. Repeat step 2. 9. Remove FIELD gauge. 10. Look at the carrier, you should have 3 lines now. If you do NOT, I would say there is a headspacing issue. This is assuming you are using all 5.56 gauges in a 5.56 chamber, or .223 gauges in a .223 chamber. |
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I don't know about any issues with your gauges, but unless you are piecing together a rifle out of used parts or a Blackthorne kit, you generally don't need to sweat the headspace. New parts from any reputable name brand, even down to DPMS, will bolt together and run right out of the box. |
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Why are you dry firing into a headspace gauge? That a no no.
Remove your extractor and ejector from the bolt and GENTLY close the carrier/bolt combo with GENTLE pressure on the back of the carrier. Don't let the carrier fly home with buffer spring pressure. That merely hammers the bolt closed. "Feel" for the pressure required to lock the bolt. Treat it like a woman. |
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Quoted:
Why are you dry firing into a headspace gauge? That a no no. Remove your extractor and ejector from the bolt and GENTLY close the carrier/bolt combo with GENTLE pressure on the back of the carrier. Don't let the carrier fly home with buffer spring pressure. That merely hammers the bolt closed. "Feel" for the pressure required to lock the bolt. Treat it like a woman. what if he is abusive to his women? <––- strictly a joke i don't know anything about the guy |
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Quoted:
I don't know about any issues with your gauges, but unless you are piecing together a rifle out of used parts or a Blackthorne kit, you generally don't need to sweat the headspace. New parts from any reputable name brand, even down to DPMS, will bolt together and run right out of the box. +1 I've built 10+ uppers, and never headspaced them. |
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Quoted:
Why are you dry firing into a headspace gauge? That a no no. Remove your extractor and ejector from the bolt and GENTLY close the carrier/bolt combo with GENTLE pressure on the back of the carrier. Don't let the carrier fly home with buffer spring pressure. That merely hammers the bolt closed. "Feel" for the pressure required to lock the bolt. Treat it like a woman. +1, also your gauges may have lost their proper measurement by slamming them into the chamber with the force of the buffer spring. Unfortunately, they can not be trusted now 
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Quoted:
Quoted:
Why are you dry firing into a headspace gauge? That a no no. Remove your extractor and ejector from the bolt and GENTLY close the carrier/bolt combo with GENTLE pressure on the back of the carrier. Don't let the carrier fly home with buffer spring pressure. That merely hammers the bolt closed. "Feel" for the pressure required to lock the bolt. Treat it like a woman. +1, also your gauges may have lost their proper measurement by slamming them into the chamber with the force of the buffer spring. Unfortunately, they can not be trusted now
x2 I would not trust those gauges any more..... 
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you really dont need the go, go/no gauges.
military only uses a field. if the fully assembled carrier goes in even with the back of the receiver headspace is suspect. and these gauges must be treated gently. anytime one of ours gets dropped its off to get the calibration checked. no exceptions. The headspace gauges have to be left in a room at 32 degrees F overnight and then measured. If they are off by .00001 then it is condemned. |
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