i think it is an abbreviation for Beretta or benelli
Interchanges with Tru-Choke or Baikal style threads
Stevens 107b is a fixed cylinder bore. So in other words, no choke and not able to be choked.
Unscrew the current choke and screw in the required choke. Making sure to clean the threads before hand.
Yes it is full choke
Briley makes choke tubes for Yildiz guns but only in 12 gauge Trulock is making them now in standard and extended versions. http://www.trulockchokes.com
Measure it, or have a gunsmith measure it, with a choke gauge.
No
Most were full choke, but the only accurate to determine the choke is to measure the inside diameter of the muzzle with a caliper. www.countrygunsmith.net
none
With standard chokes, Full Choke is the tightest. However, there are non-standard chokes for SOME shotguns (used by turkey hunters) that are Extra Full Choke.
With standard chokes, Full Choke is the tightest. However, there are non-standard chokes for SOME shotguns (used by turkey hunters) that are Extra Full Choke.
Standard is full choke first, then half-choke for a couple of minutes, then run.