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3/7/2005 6:43:43 PM EDT
Awhile back I built an M4gery and had some problems with it extracting rounds.  It would fire the round and the brass would be wedged in so tight that I needed to use a cleaning rod to get it out.  This was useing both Win. Q3131 and PMC 55 gr fmj.  I then decided on a whim one day to try some Fed XM193.  Low and behold it worked!  I then tried a total of nine other types of ammo with no problems at all!  I even managed to fire 15 rounds in a row of Q3131 before it jammed up again.  Since then I use those two types of ammo in my other AR's with no problems from them.

Thanks to all the people that responde back with helpful info on the orginal post.  
3/8/2005 12:26:05 AM EDT
[#1]

Quoted:
I needed to use a cleaning rod to get it out.  



Rough or undersized chamber.
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