GO or NO GO

[drykilned]

Does everyone here use go no go gauges when building AR 15's with mil-spec parts? I have never seen a you tube how to video
where the gauges are used during the build process. Using type II barrel and type II bolt.

Newbie to the forum. First Grendel build.

[NightFisher]

Headspace is controlled by the barrel extension to bolt fit. No way that I am aware of to adjust this fit other than try a different bolt or barrel. I do normally use the gages to verify I am good but I have not encountered a build that had a problem. I check with the bare barrel (with extension) and bolt before any assembly and the verify after the build is complete.

I haven't found a set of 6.5G gages yet.

[ricsmall]

I do but only because I have the gauges to use when chambering rifles. You can take a factory cartridge before the rifle is assembled and check the bolt for closure and rotation. When rotated closed, you should have a little wiggle room. Maybe .007”, can’t remember off top of my head. Check that number to be sure

[Klem]

Does everyone here use go no go gauges when building AR 15's with mil-spec parts? I have never seen a you tube how to video
where the gauges are used during the build process. Using type II barrel and type II bolt.

Newbie to the forum. First Grendel build.

You don't need headspace gauges to put together an AR. Headspace is fixed at the factory so they are a safety check only. Fire the first round from the hip and measure the spent case using other tools to reveal headspace.

[stetson]

I use them every time i do a new build or replace parts like a new barrel and/or bolt. It can be a bit of an expense at first but worth it to me for piece of mind. I have put together too many rifles to count and have only had one issue with a bolt being out of spec. It would not close on the go-gauge. To me its worth it for that one time something may be out of spec.

[tangodown]

They are fired from the factory to check for head spacing. I have never used them on an AR and nock on wood have never had one not fire.

[Naka16]

I've had a supposed mil-spec bolt that was out of spec. Always good to check as stated above. Wouldn't close on the go gauge, or maybe it would close on the no-go... can't remember, but swapped a few bolts and the rest were good. The online retailer made good on it and sent me a new one.

[Wargrendeleagle]

I had a Faxon match barrel 20" and a Toolcraft BCG. I rented headspace gauges. It was good on NO GO but the GO gauge wouldn't go. I ended up contacting Faxon first and they checked my barrel and bolt. Ended up being the lugs on the bolt. Thankfully Toolcraft helped me out an sent me one in spec. Great customer service by both