I repeat it is a failure to reset
There were problems in the past on MP9s
Called sear flutter that sometimes resulted in a failed trigger
Forget this light primer stuff
The gun didn't reset
The Shield had a new RAM it was supposedly immune from this problem so S&W early in 2013 used it on all their MP9s
Evidently it can still happen as it happened on my new MP9C after about 200 rds next 50 were OK
Since then I had an APEX FSS installed ( because I didn't like all the pre travel etc )
No problems 110 rds but we shall see
There were problems in the past on MP9s
Called sear flutter that sometimes resulted in a failed trigger
Forget this light primer stuff
The gun didn't reset
The Shield had a new RAM it was supposedly immune from this problem so S&W early in 2013 used it on all their MP9s
Evidently it can still happen as it happened on my new MP9C after about 200 rds next 50 were OK
Since then I had an APEX FSS installed ( because I didn't like all the pre travel etc )
No problems 110 rds but we shall see