A simple and effective holder to check the spacing from the AR15 gas key and the receiver extension. Use of the BCG to Buffer Space Gauge aka 2 Quarter Tool is documented on many popular blogs and YouTube channels.
I can not find an exact minimum spacing in the Army TM 9-1005-249-23&P Nov 2008. If someone finds it let me know and I will put it in the references.
I like to make things so I came up with this little gem.
It measures 2 quarters / 3.5mm thick and has a few stops to help hold it in place while you are cramming your Bolt Carrier Group back trying to get the gauge.
Stops to help hold it:
Opening to let the BCG slide in:
Showing the gap:
Ref:
https://www.usmint.gov/learn/coin-and-medal-programs/coin-specifications
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