What cause an M&P to fire out of battery? What is not working properly? Where do I need to look?
Background: I thought I was having pressure problems with my ammo (9mm). Primers were not flattening but everynow and then I would get a case stuck in the chamber. The extractor would pull right off the rim. I had to use a squib rod to get one out Tuesday. The primer was fine but the case was buldged at the bottom with a signifcant edge along the unsupported part. Then, when I was picking up brass, I find the piece in the picture below. I don't remember shooting it (it fired and ejected but did not feel funny). So, I thought it was my ammo but then I was having problems with very light loaded ammo - getting stuck in the chmaber. I have been shooting the same ammo in my other M&P with out any problems. So, I showed the brass to some friends at the range today and everyone at the same time said - "It fired out of battery". So, what do I need to check/look for? Any feedback would be appreciated. Thanks.


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Background: I thought I was having pressure problems with my ammo (9mm). Primers were not flattening but everynow and then I would get a case stuck in the chamber. The extractor would pull right off the rim. I had to use a squib rod to get one out Tuesday. The primer was fine but the case was buldged at the bottom with a signifcant edge along the unsupported part. Then, when I was picking up brass, I find the piece in the picture below. I don't remember shooting it (it fired and ejected but did not feel funny). So, I thought it was my ammo but then I was having problems with very light loaded ammo - getting stuck in the chmaber. I have been shooting the same ammo in my other M&P with out any problems. So, I showed the brass to some friends at the range today and everyone at the same time said - "It fired out of battery". So, what do I need to check/look for? Any feedback would be appreciated. Thanks.


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