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Post by jcarson34 on Mar 21, 2013 22:09:55 GMT -8
Ok I've built a few rifles, all of which I've never bought a complete upper, usually everything but BCG and CH. I have also bought a few stripped uppers and put barrels on. I always check headspace just to reassure myself everything is good to go. Today I took my newest build which consisted of a Blackhole weaponry 20" SS barrel, which I purchased from Surplusammo.com, and mated it with a Young MFG, hard chrome bolt carrier. To my amazement the go gauge test did not pass, is this a cause of concern? I really wanted to go break in the barrel this weekend but now I'm second guessing myself. I am using Clymer precision Go-No Go gauges (1.4636/1.4666). I ran the yet thru another AR set up and the Bolt passed the test just fine. I'm really stumped here and am not sure how to proceed.
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Post by GLSHOOTER on Mar 22, 2013 14:34:27 GMT -8
Ok I've built a few rifles, all of which I've never bought a complete upper, usually everything but BCG and CH. I have also bought a few stripped uppers and put barrels on. I always check headspace just to reassure myself everything is good to go. Today I took my newest build which consisted of a Blackhole weaponry 20" SS barrel, which I purchased from Surplusammo.com, and mated it with a Young MFG, hard chrome bolt carrier. To my amazement the go gauge test did not pass, is this a cause of concern? I really wanted to go break in the barrel this weekend but now I'm second guessing myself. I am using Clymer precision Go-No Go gauges (1.4636/1.4666). I ran the yet thru another AR set up and the Bolt passed the test just fine. I'm really stumped here and am not sure how to proceed. Part of the issue is that not all head space gauges are the same. A slight variation in the shoulder angle may result in measurement that is 0.001 or more out. Your chamber may well be on the low end of SAAMI as are many of the BHW chambers with a tight tolerance bolt. As long as you can fire factory ammunition in the chamber you are perfectly safe in using it. There is no danger of over pressure and given my choice I would go wit a minimum chamber every time. Velocities are invariably higher and it seems like it is easier to get accuracy out of them. If it were mine I would take it out and burn some powder with not a qualm. Greg
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Post by jcarson34 on Mar 22, 2013 15:05:05 GMT -8
Thanks, that's kind of what I was thinking but I wanted to get someone else's opinion first. I threw a mag with about 5 rounds in and and cycled then thru and everything seemed fed fine and ejected alright. I'm going to just go out back and let the lead go down range.
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Post by GLSHOOTER on Mar 22, 2013 15:32:59 GMT -8
Thanks, that's kind of what I was thinking but I wanted to get someone else's opinion first. I threw a mag with about 5 rounds in and and cycled then thru and everything seemed fed fine and ejected alright. I'm going to just go out back and let the lead go down range. Everyone is going to the range except me!! Greg
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Post by AndyBHW on Mar 22, 2013 17:26:19 GMT -8
I'm with ya Greg. All I ever seem to do is work. Jcarson I am glad to hear that the issue was resolved, Greg is correct in the fact that there can be a slight difference between the gauges and in some cases that slight difference can pass a go on one gauge and not pass it on another. You should be good to go though, but if not be sure to give me a call so that I can get you back up and runnin. Thanks
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