I just got mine and on my first trip to the range the LRBHO worked one time. after that is has not worked since.
Inspection of the lower showed that the small pin that works the LRBHO has gone missing. I don't know if it broke off or if it was not installed properly. either way, it no longer holds open.
I have left a CONTACT US message asking for a replacement part to be shipped to me and I will install it. I don't really want to send it back since everything else works fine.
If they won't ship out a new pin or an entire new BHO part I will just live with it.