Rastoff
US Veteran
If it is going to be a self defense gun, zero malfunctions are acceptable.I'm kind of an inexperienced shooter but I have a shield 9mm and I would like to know in your guys opinion how many FTEs is considered negligible or acceptable?
As you said, this would leave me to believe that it was you rather than the gun....I have had one awful night where i got 5 FTEs that all looked a lot like the pictures in this thread. It was really strange they all happened right after another but then the next time i went to the range after that, i put 300 rounds through it with not a single FTE.
Not having been there, it doesn't sound like something serious. Even so, 5 or 6 out of 500 is unacceptable. I generally like to run 500 rounds without a failure before I'd carry a particular gun. This is not "scientific", it's just what I do.Does it sound like something is seriously wrong or is 5 or 6 FTE's out of about 500 rounds considered normal ?
Statistically speaking, it takes about 30 events to consider something reliable. That is enough to give a statistically significant result. That has to include all the potential components of the system. So, if you have a .40S&W with 6 round mags, it would seem that you would satisfy the requirement by shooting 5 mags. Unfortunately, that's not quite right.
To be truly thorough, you'd have to test every bullet position 30 times to get a statistical significance. That means using each mag 30 times or 180 shots from each mag. If you have 2 mags, that's 360 shots. Add more mags or mags with different capacities and the numbers just increase. Change ammo and you'd have to start all over again.
Thus, 500 rounds without a failure is a good number. So, you have 300 without a failure. Another 200 without a failure and I'd say the failures were caused by your grip or some other human error.