Most guns are single-barreled.    From Wordnet, Princeton University. 

Continuing, Stephens told me how well he was prepared for emergencies; and he displayed two single-barreled, breech-loading.    From Wordnik.com.  [The Journal of Negro History, Volume 7, 1922] Reference

They wear polished steel corselets and helmets, white buck-skin trowsers, high jack-boots, and at the time of which I write their arms consisted of a brace of heavy, single-barreled pistols in holsters, a carbine and a sabre.    From Wordnik.com.  [Lippincott's Magazine of Popular Literature and Science Volume 11, No. 22, January, 1873] Reference

Some sherries and ports, things of that nature, single-barreled bourbons.    From Wordnik.com.  [Comments for BrightestYoungThings] Reference

They were single-barreled and silver-mounted, and very dainty and pretty.    From Wordnik.com.  [A Tramp Abroad — Volume 02] Reference

He had shot himself from a small, single-barreled pistol which was lying beside him.    From Wordnik.com.  [Knock, Knock, Knock and Other Stories] Reference

Their old single-barreled URLs now drop you on the doorstep of their new incarnations.    From Wordnik.com.  [eWeek - RSS Feeds] Reference

Cleggett noticed with astonishment that a single-barreled eyeglass was screwed into one of his eyes.    From Wordnik.com.  [The Cruise of the Jasper B.] Reference

The boy, whose single-barreled shot-gun had known no law, now carried a better piece, and scorned to slay a sitting bird.    From Wordnik.com.  [A Man and a Woman] Reference

In a cupboard in the inner room was a single-barreled, muzzle-loading fowling piece made at Liege, in Belgium, many years before.    From Wordnik.com.  [From Place to Place] Reference

For example, a cousin of mine, a boy of seventeen, who was a member of this company, had an old single-barreled duelling pistol, which went off with.    From Wordnik.com.  [The valley campaigns : being the reminiscences of a non-combatant while between the lines in the Shenandoah Valley during the war of the states,] Reference

In his right hand he held a small single-barreled pistol, more because he had brought it along, than from any expectation that it would be necessary to use it.    From Wordnik.com.  [John and Mary; or, The Fugitive Slaves, a Tale of South-Eastern Pennsylvania] Reference

There were the customary two beds in the room, one in one end, the other in the other, about an old-fashioned brass-mounted, single-barreled pistol-shot apart.    From Wordnik.com.  [A Tramp Abroad — Volume 02] Reference

Yes, 'twas that country I sailed against, single-handed, and endeavoured to liberate it from a tyrannical government with a single-barreled pickaxe, unloaded at that.    From Wordnik.com.  [Cabbages and Kings] Reference

Guns there were a plenty in the house - guns of all kinds, rifles and shot-guns, single-barreled guns and double-barreled guns, muskets and sporting guns, big guns, little guns, and medium-sized guns, long guns and short guns.    From Wordnik.com.  [Documenting the American South: The Southern Experience in 19-th Century America] Reference

As I stood within a few feet of them the proprietor of the shop, a very small but wiry man, stepped back quickly, drew a single-barreled pistol from his pocket, and pointed it at the other larger man, saying, "If you take a step toward me I'll kill you.".    From Wordnik.com.  [With Sabre and Scalpel. The Autobiography of a Soldier and Surgeon] Reference

All rode the Shafter saddle with iron stirrup, carried their clothing in old-fashioned saddlebags or rolled in bundles strapped in front or behind as best they could, and were armed with old-fashioned single-barreled or double-barreled shotguns or with squirrel rifles.    From Wordnik.com.  [The valley campaigns : being the reminiscences of a non-combatant while between the lines in the Shenandoah Valley during the war of the states,] Reference

By 1864, when the South was depleted of live stock, the impossibility of securing good mounts or of maintaining the efficiency of those in service placed its cavalry at great disadvantage; and when to the best of horses and seasoned veterans was added the equipment with the repeating-rifle, as against the single-barreled muzzle-loader of the Confederates, it is no wonder that the men who had followed Forrest and.    From Wordnik.com.  [With Sabre and Scalpel. The Autobiography of a Soldier and Surgeon] Reference

A tyrannical government with a single-barreled pickaxe, unloaded at that.    From Wordnik.com.  [Cabbages and Kings] Reference

It was a single-barreled weapon with a revolving cylinder set just behind the stationary barrel, which made it more like a huge revolver than Gatling’s eventual development.    From Wordnik.com.  [The Gun] Reference

"Two hundred horse pistols, single-barreled.    From Wordnik.com.  [The Riflemen of the Ohio A Story of the Early Days along "The Beautiful River"] Reference