Here's another weird uknown?

[DaveN]

Will do. I saw it the other day and saw no markings at all ( even with the grips off ) I also tried to see if I could see any rifling at all and it looks smooth as can be. I will give it a better look this weekend as last time it was after a 12 hour shift and I was knackered.

Ps thanks JP for the nice photo (informative as always)