Mine was purchased late in 2015 and probably has 2-250 rounds thru the pipe. While it has never jammed, my gut feeling is that it needs some more break-in as it doesn't quite feel as "broke-in" for lack of better description. As it likely won't be a carry gun for any time in the immediate future, it's not a major issue. I just need to dedicate a range session with a couple hundred rounds to ensure the process is completed.
Back when the Shield was first introduced, FMG Publications writer John Connor wrote a very thorough article about his test of an early specimen. Connor made sure to stress a thorough cleaning and lube for all of the little "mouse-sized" pistols chambering "roaring" calibers, and went onto summarize his initial range session favorably. At the same time, people were getting on the internet and complaining that their new mini 9 would constantly jam out of the box and that "it" was junk and they were getting rid of "it." Mr. Connor suggested that all of the mini pistols needed a break-in period before being ready to rely on - something we sort of got away from with better reliability from larger pistols.
I know a guy with a .40 Shield on his ankle as a BUG that always runs reliably every 90 days when he runs a 50-round qualification course. My dad got a 9mm about the same time as me, mostly carries it on his ankle, and is not complaining about it for any reason other than he thinks it's too heavy - but more trustworthy than his new Remington R51 at the moment - which is also less pleasant to shoot. My son and I resently went shooting with my M&P 45 and the Shield. After a couple of boxes thru the 45, he tried the Shield and felt it was more pleasant to shoot.
So, I will conclude by saying that if you buy either and something just doesn't work right, then exercise your warranty right and get it fixed by the factory. The Shield is a decent little carry gun.
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