While my M&P is not the "Shield," it has the same trigger mechanism in appearance and not under the warning label. The only time I check this mechanism is when cleaning, but I don't exercise it multiple times. I tickle all moving parts an observe for signs of wear, etc in the cleaning phase. While this seems ok, it may not have found a failure as the instructions says "test multiple times." I'll have to check out my other pistols and come up w/ a highlight list to examine prior to use. I have been thinking linearly and need to re-examine some of those concepts. I like safety tips and spending time on the gun bench. Then again, I like the mechanical mechanisms and slowness of reloading. I like to be thorough and it also helps me to be more observant with a deadly weapon where second best may not be good enough. Thanks for posting this on the forum as a reminder to keep vigilant.