No problem! I was starting to wonder if perhaps the L14 had an inverted front post by design and perhaps I had mis-spoken based on only handling Canadianissued models, it would not be the first time. Was it not the earlier generation SUSAT optical sight that had a 12'o clock mounted picket aiming post?
I was kind of curious about how you managed the rifling, but a run of rubber matting is a simple solution and easy material to work with.
Looking back at Peter's post #24 in this thread, gave me a bit of a laugh, it was a common fool's errand to send a new guy off to CQ looking for a BFA (Blank Firing Attachment) for the 84mm, seems the joke was on us all of these years, there is such an item.
We had the 7.62mm subcal adaptors for firing a Tracer, and the were a bit of a pain because they had to be cleared as their own weapon since they were essentially a simple single shot rifle with an external "button" trigger which was activated by the 84mm firing pin. They got old fast and the real fun was launching inert "cement head" RAP's at old Ferret and Sherman hulls and hearing the comical clang/bang as they struck.