308 Ammo. Was shooting my HK91 and had this happen. I know what caused it but thought I'd post it in case others had similar problems and didn't know what happened. Top round is normal.
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[IMG=http://img522.imageshack.us/img522/3631/308hk032jw0.jpg][/IMG]
[IMG=http://img522.imageshack.us/img522/9606/308hk031ew6.jpg][/IMG]