Solid bcg for an ar-9 - Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

So i am new to the AR-9 platform, but had read good things about Stern Defense so i figured i would give them a try. I am happy to report that the BCG has functioned flawlessly through its first couple hundred rounds. I have it paired with and Aero EPC 9 upper, as well as the Stern Defense Mag AD9. Feeds rounds from both standard glock OEM mags as well as the ETS mags i have tried so far. If you are on the fence about what BCG to install in your AR-9 project, don't hesitate to go with Stern. I would highly recommend based on my experiences thus far.