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AR15.COM
6/20/2017 6:39:56 PM EDT
Hello Nathan,  I have your 14-1/2" gunner barrel with the pinned and welded slim flash hider.  I also have a new, unused WMD NiB complete BCG.  It has been my experience that when using components from respected brands there is no problems.  Am I GTG with this combination or do I need to go to the added expense and time of having the combination measured for correct head space?

Thanks,

Rick
6/20/2017 7:11:01 PM EDT
[#1]
Out of the 8 or 10 rifles(including two Faxon barrels)I've checked I've only had one that didn't check out prefect and even that one was acceptable(it was a little tight).

You should be fine. But, on the other hand if you're going to own ARs long term it wouldn't be a bad idea to invest in at least a No Go and field gauge.
6/20/2017 7:18:44 PM EDT
[#2]
I thought about that, I would like one of the USGI gauges that do not require the bolt to be disassembled.  So far I haven't been able to find one under $200.  I have been looking for about a year.  Any ideas where I could find a reasonable priced one (Field is the one I need)?  But do you think the WMD and Faxon will be compatible?
6/21/2017 9:06:30 AM EDT
[#3]
Quote History
Quoted:
I thought about that, I would like one of the USGI gauges that do not require the bolt to be disassembled.  So far I haven't been able to find one under $200.  I have been looking for about a year.  Any ideas where I could find a reasonable priced one (Field is the one I need)?  But do you think the WMD and Faxon will be compatible?
View Quote
You do not need to disassemble, it just makes it easier to check, that's all.

We ALWAYS recommend checking if using components from brands outside Faxon.
6/21/2017 7:25:40 PM EDT
[#4]
Quote History
Quoted:
I thought about that, I would like one of the USGI gauges that do not require the bolt to be disassembled.  So far I haven't been able to find one under $200.  I have been looking for about a year.  Any ideas where I could find a reasonable priced one (Field is the one I need)?  But do you think the WMD and Faxon will be compatible?
View Quote
I don't have a USGI gauge, mine are Fosters.
6/22/2017 5:21:28 PM EDT
[#5]
The Forster gauge is not notched for the ejector.  I'm looking for one that allows the headspace to be checked without disassembling the bolt.  I understand you can get the gauge to work on an assembled bolt, but it is not accurate and might give a false result.  The USGI part #NSN 5220-00-070-7814 will do the trick, but it is priced from $250 to $651 depending on where you get it.  I'd jump on one for under a hundred.
6/23/2017 9:01:26 AM EDT
[#6]
Quote History
Quoted:
The Forster gauge is not notched for the ejector.  I'm looking for one that allows the headspace to be checked without disassembling the bolt.  I understand you can get the gauge to work on an assembled bolt, but it is not accurate and might give a false result.  The USGI part #NSN 5220-00-070-7814 will do the trick, but it is priced from $250 to $651 depending on where you get it.  I'd jump on one for under a hundred.
View Quote
You do not have to remove the ejector to test headspace. Put the gauge in the chamber and use the forward assist to slowly try to close the weapon.
6/23/2017 1:33:16 PM EDT
[#7]
Quote History
Quoted:


You do not have to remove the ejector to test headspace. Put the gauge in the chamber and use the forward assist to slowly try to close the weapon.
View Quote
I've done this before I had the gauges and it works fine.

Removing the ejector really isn't that hard of a process either. I don't have any special tool for putting the ejector back in so it takes a little bit more effort but it's still not that bad. You just need to find a way to compress the ejector spring and be able to get the roll pin started at the same time.
6/24/2017 7:36:25 PM EDT
[#8]
Thanks for the info.  I'll try it with an assembled bolt and see how it works.  Never thought it would, but your ideas are all sound.
6/24/2017 7:38:12 PM EDT
[#9]
one more question, should I use a 223 or 5.56 set of gauges?  My barrel is the Faxon gunner.
6/26/2017 9:11:30 AM EDT
[#10]
Quote History
Quoted:
one more question, should I use a 223 or 5.56 set of gauges?  My barrel is the Faxon gunner.
View Quote
We chamber for 5.56 NATO, but use the .223 Remington gauge lengths for our testing.

What you are most concerned about are the "Go" and "Field" gauges, so use the Remington which tightens up the allowable tolerance slightly.