I'm the guy who created this 'Rube Goldberg' engineering marvel. It isn't a test bed- it started life as a shop project of a sergeant of mine's son in New Jersey. It was meant to hold my service match rifle (US Rifle Cal 30 M1) for cleaning from the muzzle end. It was out of perhaps and over abundance of caution that I went this route to test the PH, a very light 1 frame 12 ga.
It worked and worked very well.
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