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Posted: 3/21/2012 12:34:45 PM EDT
Just finished my first 9mm build used a upper and lower that I had. Upper got a 10.5" barrel and fake can CMMG , lower got a pro mag block "to try first to see if I like a 9mm AR'' RRA buffer and mags were Uzi milled to info found on line. runs for 5 or 6 shoots then a empty case doesn't get ejected and ends up cross wise in front of bolt, tried my standard carbine buffer and get the same. so other then tossing the promag  any suggesting what to try
We're going to like the 9mm AR I can see that , SWMBO will be wanting her own |
| You still need to make sure the ejector is as close to the bolt side of the ejector groove in the bolt, and as high in that groove as possible without dragging. Your problem with empties still in the upper is caused by the mag pushing the new round up, but the old case still being held on the bolt by the extractor, instead of being kicked out by the ejector. |
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