5.56 NATO GO/NO-Go Gauge Set

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5.56 NATO GO NO-Go Set

Headspace gauges from precision ground hardened US steel to SAAMI’s ANSI tolerances. Headspace is the distance between breech face and the base of the cartridge when the action is closed. It is best to remove the extractor, ejector, and firing pin from the bolt to achieve optimal results when checking headspace. The use of both GO and NO-GO headpsace gauges is essential for all newly reamed chambers or a newly installed barrel to a trunnion . This ensures a safe and accurate chamber that will accept SAAMI maximum ammo. Warning – Never force an action closed on any gauge.

  • 5
    Go No Go gauges

    Posted by Kyle on Apr 24th 2024

    Shipped fast thanks!

  • 5
    Go/no-go gauges

    Posted by Dave on Feb 25th 2022

    Great quality and service from AoA. Second set of gauges purchased from AoA, so I knew where to go when I needed this caliber. Better value too compared to other competitors that sell the gauges separately.

  • 5
    Go nogo gauges

    Posted by Thomas Hanke on Feb 11th 2022

    A definite must when building your own. There are components from top of the line companies out there that are not to spec. Never had an issue until recently. Complete bcg and barrel from same reputable company and it would not close on a go gauge. Yes the bolt was disassembled then checked. Don’t know why it wasn’t checked at company. So will never build another without checking this. Highly recommend to get them, not overly expensive either. Or better yet find a buddy who has them!!!!!! But check.

  • 5
    5.56 go nogo guage set

    Posted by Chuck on Jul 4th 2021

    High quality Reasonably priced. An essential item for anyone who dismantles, alters and reassembled . Who can take a chance on not checking headspacing?

  • 5

    Posted by Luke on Feb 18th 2021

    Gauges are excellent, clearly marked and still coated in a thin film of cutting fluid. AOA service was outstanding, especially under the circumstances, order was shipped immediately. Will be back for more.

  • 5
    Gauges are machined and ground and perform well for my needs.

    Posted by Kris on Dec 25th 2020

    I’ve needed a set of headspace gauges for a while and these are well made.

  • 5
    Great investment

    Posted by Nate Feinstein on Sep 5th 2020

    Definitely a great investment for peace of mind. Got them fast, and determined viability of the weapon in minutes. I'm definitely going with this set in another caliber, if the need ever arises.

  • 5
    Excellent, must have product

    Posted by Yan on Aug 20th 2020

    A must have product for anyone who is assembling their build. Peace of mind knowing your headspace is good prior to sending that first round down the barrel. Highly recommended.