GO or NO GO

[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.