This type of information is not published. Perhaps it would be best to request that information from Browning directly. As a rule, Browning has never released production figures, but simply the serial number sequences.
Check w/ Browning, but I think you are correct- BOSS will interfere with iron sights.
possible. better with shoulder support
Grips, magazines, sights.
Best to ask a gunsmith for assistance
No.
No
50-500 usd
What you have is a Browning hi-power,semi auto 9mm handgun that was made in Belguim for Browning in the year 1981 according to the serial number that you provided.The value of these fine made pistols is between 325-475 dollars,based on your hi-power having between 60%-90% of its original finish remaining and a good bore.
For MANY firearms (but not all) the sights may be adjustable by the user. However, in the case of a shotgun with bead sights, or a revolver with fixed sights, they are not adjustable. Some semi=auto pistols have sights that can be adjusted by a gunsmith. Most rifles will have a user-adjustable sight.
Most aftermarket sights are fiberoptic types such as Williams FireSights or the Tru-Glo sights. I dont know of any specific target applications.
It would be worth approximately $125.
Austria and the US, although all are stamped AUSTRIA. They're stamped Austria because they're all made in Austria. The "US" pistols have to be shipped with flimsy adjustable sights in order to be legally imported into the US.. all the US division of Glock does is replace these with US-made fixed sights.