Quality product, works flawlessly - Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

This product works 100% with my echo trigger and my sylvan arms folding stock adapter. The NiB finish is a must for a dirty suppressed 9mm blowback. I couldn't recommend this product enough. I wasted money on other 9mm carriers before getting this one, don't make the mistake I made and just buy this one. Most 9mm carriers have to narrow of a slot to fit the echo trigger.