And don't they also shoot a special load for NYPD? Its factory ammo but a lower velocity than sold over the counter to everyone else I think.
They used to, and that may have been part of their problem, lessened sinch their change to a higher-intensity loading. Obviously, in heavily-populated New York, overpenetration wiould be of considerable concern, and there are two ways to address that: with a lower-powered load that doesn't penetrate as much, or with a hotter, lighter hollowpoint bullet that expands in the intended target [IF it's hit...big *if* there!] and has its penetrating ability reduced thereby.
But see following, from the material posted iat the link in the previous post:
When this issue first arose circa 1996 the NYPD was utilizing a standard pressure 115 grain FMJ round produced specifically for the department by Winchester. It was designated a non-standard load by Winchester, and identified as the "Q4146" round. Since this was not a very hot load it was postulated that the ammo was the cause of this malfunction. Unfortunately, when the NYPD transitioned in 1999 to a "hot" 124 grain +P Speer GDHP that was specifically "souped up" to around 1225 FPS, the occurrences of Phase Three's diminished, but did not altogether disappear. It should be noted that during this time frame none of the other department-approved 9mm semi-automatic pistols in use experienced a single Phase Three malfunction.As this malfunction became more of an issue, the Department naturally approached Glock, Inc. and requested assistance. At the onset, Glock refused to acknowledge the problem and only reluctantly agreed to replace one-for-one the guns that displayed the problem.