I assume it has a single non-selective trigger, beavertail forearm and a shallow vent rib. If so, that gun was made by Beretta and is similar to their GR series. It is worth $800 to $1,500 depending on condition and buyer.
I also have a Charles daly empire grade 20 gauge side by side, single non selective trigger, and extractor serial no. 746. my gun has 28" barrels and is choked IM/M or three stars and two stars. I have researched this gun for months and the markings that will tell the tell is the gun makers stamp. should be on the barrels. there should be an oval with a PB or VB if it is a Beretta or Berandilli respectively. it could be a Sabatti. there also should be markings for the manufacture date XXIII or VVIII etc. if its Beretta you can go to their web site. hope this helps, Please post what your marks are. Mine is not legitable. all I can see is half the oval and a B, valve will be determined by manufacture.
There is a selector switch for the barrel you want. Not both barrels at the same time
It should be marked on the barrels near the breach.
Barrels.
The one who makes barrels. A barrel maker is called a cooper
the gun has two hammers and on the barrels is stated laminated steel
The plural form of barrel is barrels.
front trigger fires right barrel. back trigger fires left. boone
Beginning of the barrel to end of barrel.
Um... Barrels
Stevens 12ga. /mod dhead naught
I would look at the number of barrels. If there is more than one barrel, you know you have at least a double barrel shotgun. If there are 1 or less barrels, then you don't.
A barrel is 42 gallons. Divide gallons by 42 to get barrels.