I was shooting my newly traded-for CAI galil that was sent through Jeff miller (highly praised builder over at the Uzi forums) at hillbilly firearns for a complete rework. Had a few double feeds,one of which was operator error ( little sister had to try to rack the charging handle two or three times to get it) the other was when I was shooting it. These don't bother me much,Jeff said his warranty goes with the gun and specifically said to call after I shoot it with a report. Anywho,I had some downright strange failure to go into battery malfunctions. I would try to shoot it to find that it was stuck at half battery,and I had to use lean the charging handle on a table and charge the whole gun to get it to cycle the action only to find what seemed to be an elongated 5.56 cartridge with a inset bullet,but what really happened was that the previous casing had split clean in half when shot and the bolt had extracted the bottom half and then fed a new live round into the top (case neck)half of the previous casing that was left in the chamber,needless to say this is what caused it to fail to return to battery. Pictures are fuzzy bc it's on an iPhone and I'm riding in a car right now but here's a visual if it helps anybody. I've never seen malfunctions like this,and just wondered if anybody knew what is going on. Will be emailing Jeff about it later to see what he has to say about it,but a part of me thinks it could be crappy brass?.