N/A barra 250z bolt

I am wondering if anyone else who owns a barra 250z has a bolt that does not have some sort of lock in the in battery position, In other words on mine after chambering a pellet if you were to turn the rifle upside down and then veriticle the bolt just falls open. Not good for a hunting rig. There is a small drilled divit in the bolt about 2" from the rear of the bolt that might suggest that a ball and spring detent might be missing from the bore that the bolt travels in, I've contacted barra but have not had any responce, any thoughts?
 
If you remove the rear pic rail there is a silver adjustment screw underneath that houses a spring loaded ball bearing. Turning it clockwise will increase the tension on the detent hole in the closed position. I recommend using some blue locktite once you have it set where you want. Mine tends to loosen over time and I will need to locktite the next time I adjust it.
 
If you remove the rear pic rail there is a silver adjustment screw underneath that houses a spring loaded ball bearing. Turning it clockwise will increase the tension on the detent hole in the closed position. I recommend using some blue locktite once you have it set where you want. Mine tends to loosen over time and I will need to locktite the next time I adjust it.
You nailed that one. Thanks.