Help Diagnose My 11.5 SBR

[Eric]

In addition to the above info, you need to ensure the gas system is good. Does the action reliability lock open after the last round is fired?

[Robb Jensen]

1. Lube BCG well.
2. Test for short stroking. If it doesn't pass this test don't proceed to 3 until it does.
3. Test for positive ejection. If weak pull ejector and spring, clean out ejector channel in the bolt install new ejector spring and reassemble.

[kevN]

Thanks everyone. Got to the range today with a known good BCG to borrow parts from and when I swapped ejector springs problem went away.