PTG Headspace No-Go Gage 300 AAC Blackout (7.62x35mm)

Product #: 643691 PTG #: 31464NoGo
$27.99
Status:
Date expected in stock: 05/31/2013
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Product Information

This headspace gage is used to accurately measure the headspace dimension of the chamber. Necessary when cutting a chamber or when checking the chamber of a used gun to be sure the headspace dimensions are within safe limits. All gages are made to SAAMI specs. If a the bolt closes on a Field gage, the chamber is very close to or already over SAAMI specified maximum chamber size.

Technical Information

Material:
  • A2 Tool Steel

    Notes:

    Go Gage:
  • Ascertains correct headspace dimensions by duplicating the minimum allowable distance, from the case head (or boltface) to the datum line of the cartridge's shoulder, allowed within the chamber to secure a loaded cartridge and allow the breech to be closed in a safe manner for firing.
  • If the firearm locks up in battery when the gage is inserted, then it is within acceptable minimum headspace dimensions and may be used.

    No-Go Gage:
  • Duplicates the distance over the maximum allowable, from the case head (or boltface) to the datum line of the cartridge's shoulder, allowed within the chamber to secure a loaded cartridge and allow the breech to be closed in a safe manner for firing.
  • If the firearm locks up in battery when the gage is inserted, then it is not within acceptable maximum headspace dimensions. The firearm should not be used and should be examined further by a knowledgeable gunsmith.

    Field Gage
  • Duplicates the maximum allowable distance, from the case head (or boltface) to the datum line of the cartridge's shoulder, allowed within the chamber to secure a loaded cartridge and allow the breech to be closed in a safe manner for firing.
  • If the firearm locks up in battery when the gage is inserted, then it is at the maximum acceptable headspace and should be examined further by a knowledgeable gunsmith.
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