HPT and MPI testing. Why?

[lysander]

To the underlined, that makes sense. As you stated, if you dont exceed the yield point, the effects would not be measurable - within the effects of all the other variables.

Which brings up a point, people want to fine tune minutia within a system that incorporates multiple variables, its not realistic without a single, dedicated test system, or massive identical case subjects under controlled circumstances

Or, have a reasonably good mathematical model of the system, which for the gas system isn't that hard to do, one is available.

J. H. Spurk, "The Gas Flow in Gas Operated Weapons," Ballistic Research Laboratories Report No. 1475, February 1970

Nathan Gerber, "Sensitivity Study of Rifle Gas Systems," Ballistic Research Laboratories Report No. 1524, January 1971

W. M. Werner, "Comparison of a Theoretical and Experimental Study of the Gas System in the M16A1 Rifle," Ballistic Research Laboratory Report No. 1548, August 1971

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The thing that amuses me to no end are the people that insist that you have to stick to the MIL-Spec on minutia like the cadmium plated detents for the takedown and pivot pins, and then go on about how great their chrome-silicon springs are . . .