Crude description of the BVA is it's a bung, which when the breech is closed goes into the breech preventing a "back flash" into the turret.Having read the CR2 thread it left me with a couple of questions.
Chieftain's gun sealing was done by closely machined steel rings in the breech mech.
How was this sealing achieved in CR1 and CR2? Steel rings again or something different?
Agreed, which is why I said "among other things"There was no single factor that caused the Castlemartin incident, there were a number of errors. In my best technical opinion these include:
Error in Drill
Error of Drill
Equipment Failure - Design.
Lives pointlessly lost and changed forever. I hope they aren’t wasted by doing nothing to rectify these issues.