The Browning web site has a search function that will assist you.
Browning's web site has the current information.
Yes
The markings on the receiver and barrel will tell.
Library.
50-500 uSD
No. Not recommended. The barrel walls are not fit for screw in chokes. Belgian A-5 barrels that had that procedure done in the 60's and 70's were mostly unsuccesful. The barrels ended up being cut down or discarded. Aftermarket screw in chokes worked well with the Over/Under Browning guns, but not the Automatics. It's recommended to purchase a Japanese made barrel (with invector chokes) and have it fitted to your Belgian gun.
There is no "Standard" choke. A5's could be purchased with one of many different chokes, however, the more common chokes on a 28" barrel were Full and Modified
$150 - $400 depending on condition and year made (barrel markings determine the period when the barrel was made)
Browning Choke Markings "* " = full "*- " = improved modified "** " = modified "**-" = improved cylinder "**$" = skeet "***" = cylinder
You will need to contact Browning.
Need to know all the markings on the barrel.
BROWNING CHOKES AND THEIR CODES (ON REAR LEFT-SIDE OF BARREL)* designates full choke (F).*- designates improved modified choke (IM).** designates modified choke (M).**- designates improved cylinder choke (IC).**$ designates skeet (SK).*** designates cylinder bore (CYL).INV. designates barrel is threaded for Browning Invector choke tube system.INV. PLUS designates back-bored barrels