gerritm Posted January 2, 2012 Share Posted January 2, 2012 (edited) Maybe someone can give me an idea what is happening with these rounds jamming in my son's .223 AR carbine. It is an Olympic lower and we are not sure what the upper is. The barrel is stamped .556. these jams happen randomly, no obvious pattern. Gun is new, 500 rounds thru it, only change is a 1" longer DPMS adjustable stock. Reused the buffer and spring. Gun functions 99%. We shoot only brass cased PMC, Lake City, or Federal. We have shot .556 LC and it seems to happen more often with the .556 than the .223. It has happened with different mags. We use Magpul 30 round P mags. Seems like a double feed where the bottom shell deforms or bends and if it makes it into the chamber it jams. Once into the chamber we have to pound the stock on the ground or remove it with a knife blade. Has happened on the first shell or into the mag at random amounts fired. Seems like if you download the mag to 28 it is less frequent, but only happens once every 100 rounds or so. Any ideas or help would be appreciated. gerritm Edited January 2, 2012 by gerritm Quote Link to comment Share on other sites More sharing options...
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