12 has a bigger bore.
Try www.gunbroker.com and www.auctionarms.com for a good look at what various guns are selling for. Singleshot shotguns can be quite economical, but some are rare and are much more expensive.
No.
Crescent
yes. Most gun shows should have a few, but they are roughly 4-5x the cost of a 12 gauge. yes. Most gun shows should have a few, but they are roughly 4-5x the cost of a 12 gauge.
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...
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.