Does not work with echo sport trigger - Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

I already had a 9mm bolt but as with most as far as the echo sport trigger the hammer slot is to naefor the hammer lock. So instead of modifying the bolt I had I decided to get the stern defense bolt, I plan on building another 9mm anyway. Stearns bolt says it works with the echo sport trigger but after installing it it does not. The slot is wider to accommodate the hammer lock but it is to long to press the hammer lock forward to even pull the trigger. Maybe I'm not understanding something but don't see how it would work. So after all that I modified the bolt I had and works perfectly. Besides working with the echo sport trigger, looks like a nice bolt.