The reasonable assumption is that you are referring to something such as the 'Vang Comp' system. The primary purpose of venting the barrel in any firearm be it a rifle, shotgun, or a pistol is to reduce the impulse of recoil directed into the body of the shooter. Venting a barrel achieves this by redirecting the propellant gases so that a portion of said gas is vented off-axis relative to the barrel.
Not only does reducing this recoil impulse make extended shooting easier by inducing less fatigue on the handler, it can improve accuracy by creating a more stable launch platform for the projectiles being sent on their way with each shot.
Best left to a trained gunsmith.
Your browning auto-5 shotgun in 16ga. Was made in 1922.
It's a Stevens 620.
Yes, as long as it has the right choke for slugs (cylinder or improved cylinder), the vents will make no difference to the slug, and will reduce recoil slightly.
Your question can't be answered as written. What Model? What are ALL the markings? What gauge? How long is the barrel? What type of finish? Mossberg 500C, 20 gauge, 26" accu-choke, serial number K064007, checkered wood stock, blued barrel, vented rib barrel.
A shotgun barrel with a cylinder bore choke.
Shotgun barrel that has a raised rail (rib) that runs the length of it. Here is an auction site with pictures of a shotgun with vent rib barrel. http://www.gunbroker.com/Auction/ViewItem.asp?Item=80157268 on a firearm it is a raised bar above the barrell
yes a rifled shotgun barrel or smooth shotgun barrel
Buy Shotgun. Buy Shotgun.
60-260 usd
collects dirt, may come off
The vent rib breaks up the heat waves that rise from a hot barrel which interfere with sighting.