Thanks. I will get measuring.
I am a Man of La Northumberlandia, a true Knight and spend my days on my Quest (my duty nay privilege!) and fighting dragons and unbeatable foe, to right the unrightable wrongs, to bear with unbearable sorrow and dreaming my impossible dreams.
Yes, does appear to be 16mm. But the hole in my stock seems to be oval with the widest measurement at a shade over 17mm.
I am a Man of La Northumberlandia, a true Knight and spend my days on my Quest (my duty nay privilege!) and fighting dragons and unbeatable foe, to right the unrightable wrongs, to bear with unbearable sorrow and dreaming my impossible dreams.