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So the big disappointment today was the operation on my new 9mm AR.
It has a PSA Colt SMG lower and a side charging upper from Matrix.
What I suspect is the ejection port is timed to work with Glock style lowers. Using the Colt style lower it throws the brass in such a way that it fails to exit the chamber and fouls the next round.
I tried it with two different bolts, one ran better than the other (which is to say worked 70% of the time instead of jamming every round)
I have a Glock lower and will test the theory some day soon but in the mean time I thought I would post to see if anyone else had a similar issue or any ideas.
Couple pics of the brass and the side charger upper next to a PSA slab side factory 9mm upper
It has a PSA Colt SMG lower and a side charging upper from Matrix.
What I suspect is the ejection port is timed to work with Glock style lowers. Using the Colt style lower it throws the brass in such a way that it fails to exit the chamber and fouls the next round.
I tried it with two different bolts, one ran better than the other (which is to say worked 70% of the time instead of jamming every round)
I have a Glock lower and will test the theory some day soon but in the mean time I thought I would post to see if anyone else had a similar issue or any ideas.
Couple pics of the brass and the side charger upper next to a PSA slab side factory 9mm upper