We've all heard of the convergence of multiple flaws that combined to create a "perfect storm"......this is probably what stumped me trying to find a solution. To start with I picked up a S&W MP 15-22 pistol as a fun plinker for the grandkids. First trip to the range was pretty frustrating, failure to fire, failure to eject, empties getting jammed around the bolt. Go to You-Tube and see if others are having this problem, sure enough there are dozens of videos on how to fix your MP 15-22. Extractor needed to be bent upward, replaced the firing pin and claw extractor with Volquartsen upgrades. Primer strikes were deeper and more pronounced, ejections improved. Guess Smith & Wesson just had a bad day when this one was built. Still had issues with duds......couldn't fire more than 4-to-5 rounds without a failure. Using a brick of Remington Yellow Jacket and the rims were showing good firing pin strikes. Tried taking some of the duds and rotating them through again....still wouldn't ignite. In three boxes of the ammo was experiencing nearly a 10% failure rate. Guess someone at Remington was having a bad day too. Unfortunately I still have four more bricks of the Yellow Jacket stashed away. So I'll write this off as a learning experience and hope those manufacturers have better days in the future.