iGauging Plug for Firing Pin Protrusion Measurements

thingiverse

I was watching this video from School of the American Rifle: 5 Colt BCG Physicals https://youtu.be/8NmF0LCWdqU?t=966 (Video link starts at 16:06) and noticed that he had to modify one of the included extension shafts of the iGaging Digital Depth Indicator Set so the firing pin would not go into the threaded hole. That got me thinking about printing something up. This is what I came up with. The threaded plugs iGauge Base Plug.stl don't have the ejector notch tiGauge Base Plug Ejector hole.stl do. I like the notched one better. I don't have to remove the ejector to use. Both are sized to fit snug in the bolt face without getting stuck by the extractor. The plugs also help hold the bolt in place while testing. iGauge Base Plug Small.stl - will fit into the gauge hole. use if you have no other support.