The FBI is returning a couple lots of ammunition. This somehow got conflated with an older internet piece of internet BS and is now making the rounds of the cop forums again.
(Seriously, google "Q4355 recall". If it were a real thing, it would be on Winchester's page, which it is not. Also, pressers probably would have been sent out, which they weren't.)
The FBI is working with Winchester on a potentially serious condition affecting all recently produced .40 S&W, Winchester, Q4355, 180grain, Bonded SERVICE ammunition. Some of the cartridge casings were produced without a flash hole. This condition completely eliminates the ability of this Service cartridge to fire.
This is a silent killer in that no visual inspection by FBI personnel can detect this manufacturing defect and it would only be known at the time the Agent attempted to fire their handgun. A limited number of problems have been reported: however, this is such a dangerous condition [that] immediate action across the FBI is necessary.
Affected ammunition will have a four character 'day code', two letters, two numbers, i.e., FA 42. All Q4355 with day codes beginning with the letter F and any Q4355 with the two letter combination of EN are included in this recall. This ammunition must be removed from FBI service weapons and magazines IMMEDIATELY.
Again, boxed ammunition with the following codes must be removed from service IMMEDIATELY:
- Product Code: Q4355
- Day Code: Any code beginning with F or EN