WHAT DOES WINCHESTER 219 ZIPPER AMMO FOR SALE MEAN?

Jeff said: I used one thousand rounds of this in my mp5 and only experienced 2 failures. A single was a failure to eject, one other was a failure to detonate.Maintain your firearm tighter. Luke dude Will not question mentioned: New to me. Cheep so I purchased five bins. Just shot one total 15 round mag out of my Glock 43X. Beloved it! Sure it does