12 has a bigger bore.
The size of the bore.
Size of the bore. 12 gauge is bigger.
Crescent
No.
There are many different models of 12 gauge shotguns for sale at online retailers like Amazon and GunBroker. One can also check online at eBay for 12 gauge shotguns which are for sale or trade.
These shotguns came in 20, 28, 16, And 12 gauge calibers
You can't
The lower the gauge the heavier, sheet metal, wire & shotguns...
Size of bore, size of ammuntion
12 gauge shells.
Numerous companies in many countries have made single shot 12 gauge shotguns.
Remington has made many thousands of 12 gauge shotguns in dozens of different models/configurations.