BROWNING CHOKE CODES (check on rear of barrel, usually on the left, but, sometimes on the right). ( for an O/U open and check flats)
* Full
*- Improved Modified
** Modified
**- Improved Cylinder
**$ Skeet
*** Cylinder bore
INV Browning Invector choke tube system.
INV. PLUS Browning Invector Plus back-bored barrels Note: Inv and Inv Plus are not interchangeable. http://www.browning.com/customerservice/qna/detail.asp?ID=100 will give you the numerical data.
Your gun was made in 1963. Use the link below to determine choke.
A poly choke is an aftermarket choke. The choke twists to different settings. It should have marks to determine settings around the collar of the choke
GO TO BROWNING WEBSITE AND GET CHOKE SPECIFICATIONS FOR DIFFERENT CHOKES AND MIKE END OF BARRELL
Amount of muzzle constriction
How much muzzle constriction there is.
'*' 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).
If you mean a choke bored barrel, it designates the amount of constriction a shotgun barrel has.
Try browning.com
Cylinder bore- which is no constriction at all.
Browning made choke tubes.
Depends on how choke markings on the weapon.
Browning has a web site with lots of information and a search function that will help you.