Help identifying this luger...Swiss 06/29 9mm w/6" barrel

[acastell]

Hello all, been a while since I have posted...I came across an interesting luger and wanted to see if anyone has some more info..I will not ask for an estimated value , but if you want to offer, it would be appreciated...of course, value depends on condition and these pics will not show that too well..

Anyway, this is an 06/29 Swiss Luger with a P stamp, 'privat' I suppose??

This luger is chambered 9mm with as 6" barrel...one would assume this was re-barreled in 9mm and a 6" barrel...but, what strikes me is that the barrel has the serial number and the BP symbol stamped in the collar of the barrel (collar is probably not the right term, but the narrow area just before the barrel meets the receiver) I believe it is a BP symbol, I could have this wrong...

My question: Was there ever a 9mm Swiss Luger manufactured with a 6" barrel?

If the barrel was unmarked, I would not be as curious, but, since the barrel has the serial number and BP symbol, similar to many 30 cal 4.5" Lugers I have seen, I thought perhaps this was a factory optioned Luger...

The serial number is 715XX

I did read that some high profile shooting competition was won (Olympics????) with a long barreled Swiss 9mm...given the success of the longer barrel 9mm in the competition, perhaps this was a popular modification to a standard 30 cal, 4'5" luger back in the day...

Any ideas would be appreciated...!!!

Will post pics shortly...