Sorry I have been hopping from job to tournament to airport so now I finally have some time to reply:
When I brough the gun to Earon he work on it a while to tune the sear to work with the raw frame. I can ask earon for you to see if a new sear would allow it to work with the BBA frame. But I am not going to be back in the state for 2 more weeks.
Hopping to moscow now and then to rome.