Mag Gauge, for 140mm/170mm Magazines, Anodized Aluminum, Official USPSA®, by Evolution Gun Works

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USPSA® Mag Gauge

In USPSA® competition, it is imperative that you know if your mags are legal length. With competitors trying to eek out every extra round possible in their magazines, sometimes component combinations will put your mags over the legal length. And at a major match is the LAST place you want to find out. You could be moved into Open division, or worse.

Product Details:


Are your mags legal?

EGW is the official manufacturer of the USPSA® magazine length gauge to be used at all major matches and tournaments.

  • This gauge fits all known combinations of magazines and basepads.
  • CNC machined out of 6061 aircraft grade aluminum, the gauge is then anodized black.
  • It measures both 140mm (141.25mm) and 170mm (171.25mm) length magazines.


  • Material: Aluminum
  • Finish: Anodized Black
  • Measures: 140 (141.25mm) / 170 (171.25mm) magazines


Write A Review
  1. Mag Gauge

    Posted by Charles on Jun 19th 2017

    Handy object to have if you need to check your mags before a big match

  2. Works

    Posted by John on Mar 21st 2016

    Depressed that it tells me that I can't use the SNL base pads with my mag bodies.

    But it's great to know for sure.

  3. It's best to know

    Posted by Ernie E. on Mar 7th 2016

    Using SNL tool-less base pads ( Dawson ) being new to the game
    ( Sport ) I need every round I can get into a mag legally
    Cause I want to play fair and this is one of the tools to help
    give You peace of mind with no guessing