OMNI Hybrid receiver

I haven't seen any upper these won't work on,only issue I ever had was a NEA handguard that made slight contact with the front takedown pin area,but those handguard are known to do thata with many lowers.my aero precison upper is tight though,but that's the cerakote finish,which is tight on all the lowers I have,diemaco,ATI and NEA.
 
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