AR Sponsor
Posted: 10/15/2013 5:17:37 PM EDT
| I ordered a complete upper that was supposed to be test fired to check that it functions correctly. I received my upper today and it looks great but didn't come with the BCG and charging handle like it was supposed to. I contacted to company and they were very professional and said they would ship out my BCG and charging handle ASAP. Do I need to worry about headspace issues with the BCG in my upper? |
|
Quoted: I ordered a complete upper that was supposed to be test fired to check that it functions correctly. I received my upper today and it looks great but didn't come with the BCG and charging handle like it was supposed to. I contacted to company and they were very professional and said they would ship out my BCG and charging handle ASAP. Do I need to worry about headspace issues with the BCG in my upper? Read your manual, if you dont have one read one in the library on the homepage. with decent components I don't check it, it doesn't hurt to check it, but I tend to not to use shitty parts. |
| It "should" be checked, but the design of the AR and the tolerances manufacturers keep on them means it generally isn't necessary on new parts. Look at this way, if they felt it was necessary they wouldn't just send you the parts. They would ask you to send the upper back so they can install and verify themselves. They are not going to leave themselves open to liability if the numbers were not on their side. |
|
Quoted:
I'm wondering how it was test fired then sent with no BCG or charging handle. It probably wasn't. They test fire the complete uppers, but sent you an incomplete one. Probably pulled from the wrong bin or something. Another possibility is that they have a rig for test firing their uppers. When a company test fires, they are most likely just verifying the gas system is set up correctly. It isn't necessarily to make sure those exact parts they send you work together. They are probably pretty confident of that already. |
|
Quoted:
It probably wasn't. They test fire the complete uppers, but sent you an incomplete one. Probably pulled from the wrong bin or something. Another possibility is that they have a rig for test firing their uppers. When a company test fires, they are most likely just verifying the gas system is set up correctly. It isn't necessarily to make sure those exact parts they send you work together. They are probably pretty confident of that already. Quoted:
Quoted:
I'm wondering how it was test fired then sent with no BCG or charging handle. It probably wasn't. They test fire the complete uppers, but sent you an incomplete one. Probably pulled from the wrong bin or something. Another possibility is that they have a rig for test firing their uppers. When a company test fires, they are most likely just verifying the gas system is set up correctly. It isn't necessarily to make sure those exact parts they send you work together. They are probably pretty confident of that already. I guess that's possible. I'm pretty sure I have nothing to worry about. I just figured I'd see what you guys thought. Thanks for the info. |
|
Quoted: BCG dont control headspace. bolts do. Read your manual, if you dont have one read one in the library on the homepage. with decent components I don't check it, it doesn't hurt to check it, but I tend to not to use shitty parts. Quoted: Quoted: I ordered a complete upper that was supposed to be test fired to check that it functions correctly. I received my upper today and it looks great but didn't come with the BCG and charging handle like it was supposed to. I contacted to company and they were very professional and said they would ship out my BCG and charging handle ASAP. Do I need to worry about headspace issues with the BCG in my upper? Read your manual, if you dont have one read one in the library on the homepage. with decent components I don't check it, it doesn't hurt to check it, but I tend to not to use shitty parts. |
|
Quoted:
I thought the barrel extension determined proper head spacing. Quoted:
Quoted:
Quoted:
I ordered a complete upper that was supposed to be test fired to check that it functions correctly. I received my upper today and it looks great but didn't come with the BCG and charging handle like it was supposed to. I contacted to company and they were very professional and said they would ship out my BCG and charging handle ASAP. Do I need to worry about headspace issues with the BCG in my upper? Read your manual, if you dont have one read one in the library on the homepage. with decent components I don't check it, it doesn't hurt to check it, but I tend to not to use shitty parts. Why do people think one part would be solely responsible for something that requires several parts or dimensional interfaces to occur properly? Headspace can be affected by several factors. |
|
Quoted:
I thought the barrel extension determined proper head spacing. Quoted:
Quoted:
Quoted:
I ordered a complete upper that was supposed to be test fired to check that it functions correctly. I received my upper today and it looks great but didn't come with the BCG and charging handle like it was supposed to. I contacted to company and they were very professional and said they would ship out my BCG and charging handle ASAP. Do I need to worry about headspace issues with the BCG in my upper? Read your manual, if you dont have one read one in the library on the homepage. with decent components I don't check it, it doesn't hurt to check it, but I tend to not to use shitty parts. It's determined by the length between the datum of the chamber shoulder and the bolt face, as well as from the bolt face to the rear of the bolt lugs, including the engagement between the inner extension lugs. |
|
Quoted:
Please explain the kB that occurs in cases of short or long headspace in the AR15. Quoted:
Quoted:
You'll be checking headspace one way or the other. I prefer gauges over kB. YMMV. Please explain the kB that occurs in cases of short or long headspace in the AR15. Maybe I shouldn't have used the term "kB". However, headspace should still be checked. I'm not going to get in the whole debate that has been beaten to death. I used an extreme term, sorry! 
|
|
You can also measure a bucket of stripped bolts. You'll find enough variation to tighten or loosen a few thousandths as desired. Also, unless headspace is way out of whack it means little when firing factory ammo. You can have headspace of over .010" and it'll probably fire fine and never realize it. The problem comes if you try to reload that brass. With excess headspace the brass stretches/ thins in the web and often cause case head ruptures, often called a KB in and AR, on the first reload. Generally headspace of .003" on an unfired barrel/ bolt is great and stretches out to .005"-.007". Some companies like to set headspace at .001" so it settles about .003" after firing. That gives very good brass life for reloading - .007" not so much. YMMV
advntrjnky |
|
Quoted:
The headspace is set at the factory. You can't change it. Lancelot is correct in that you cannot per se make adjustments to individual parts to change the headspace values in an AR15, but you can try to get the headspace within its tolerance range by swapping parts as is instructed in TM 9-1005-319-23&P. |
AR Sponsor