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Posted: 1/27/2015 9:42:29 PM EDT
| Evening Everyone, I am a newbie to this forum and the firearms world (only a few years firearms experience) and have a question about my first AR build. I chose a 7.62x39 caliber and I am having problems with the headspace check. I am running a Yankee Hill 16in chrome lined barrel with a tactical ambush upper and bolt/BCG. The headspace go/no go gauges I bought from Midway both fully close the bolt into battery. I am in search of a field gauge to fully confirm proper headspacing. Is it possible that the bolt/barrel are not matching correctly? I installed a UTG free float rail and torqued the barrel nut to their specs. The barrel appeared to seat properly and I did not notice any issues with the upper receiver. I have read a lot on headspacing and have found its about 50/50 on people saying to check it and not check it. Just looking for some advice before I try to go to a gunsmith. |
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Quoted:
Evening Everyone, I am a newbie to this forum and the firearms world (only a few years firearms experience) and have a question about my first AR build. I chose a 7.62x39 caliber and I am having problems with the headspace check. I am running a Yankee Hill 16in chrome lined barrel with a tactical ambush upper and bolt/BCG. The headspace go/no go gauges I bought from Midway both fully close the bolt into battery. I am in search of a field gauge to fully confirm proper headspacing. Is it possible that the bolt/barrel are not matching correctly? I installed a UTG free float rail and torqued the barrel nut to their specs. The barrel appeared to seat properly and I did not notice any issues with the upper receiver. I have read a lot on headspacing and have found its about 50/50 on people saying to check it and not check it. Just looking for some advice before I try to go to a gunsmith. did you remove the extractor before using them? |
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Quoted:
did you remove the extractor before using them? Quoted:
Quoted:
Evening Everyone, I am a newbie to this forum and the firearms world (only a few years firearms experience) and have a question about my first AR build. I chose a 7.62x39 caliber and I am having problems with the headspace check. I am running a Yankee Hill 16in chrome lined barrel with a tactical ambush upper and bolt/BCG. The headspace go/no go gauges I bought from Midway both fully close the bolt into battery. I am in search of a field gauge to fully confirm proper headspacing. Is it possible that the bolt/barrel are not matching correctly? I installed a UTG free float rail and torqued the barrel nut to their specs. The barrel appeared to seat properly and I did not notice any issues with the upper receiver. I have read a lot on headspacing and have found its about 50/50 on people saying to check it and not check it. Just looking for some advice before I try to go to a gunsmith. did you remove the extractor before using them? Extractor as well as ejector need removed, but those usually prevent the bolt from closing. This sounds like excessive headspace. |
| Yes. Disassembled the bolt and placed it back in the BCG as instructed. The one thing I have not been able to find is ant technical specs on the gauges. With this being my first run at this I am simply following directions/instructions. Are the gauges supposed to be identical is size and shape? I would think one would be bugger than the other since the go gauge is minimal distance and the no go is max distance to the datum line. Am I wrong on this? |
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Quoted:
Yes. Disassembled the bolt and placed it back in the BCG as instructed. The one thing I have not been able to find is ant technical specs on the gauges. With this being my first run at this I am simply following directions/instructions. Are the gauges supposed to be identical is size and shape? I would think one would be bugger than the other since the go gauge is minimal distance and the no go is max distance to the datum line. Am I wrong on this? I have a set I can check the sizes but I would assume its different lengths but barely any difference |
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http://saami.org/specifications_and_information/publications/download/206.pdf
See page 31 for the chamber dimensions. |
| So, have you shot it yet or just being overly cautious? I put one together a few month back, checked function with a dummy round (loaded & unloaded fine). I single loaded the first 5 rounds, "just in case" - I laid a 2x2 carpet square over the receiver & let her rip. Now has 100+ rounds (all steel) through it with no problem. Make sure you use full power hammer springs or your likely to get light primer strikes. |
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