Adjective
Without a hammer.
Not requiring the use of a hammer.
hammerless nails
(firearms) Without a visible hammer; said of a gun having a cock or striker concealed from sight, and out of the way of an accidental touch.
Source: en.wiktionary.orgBy the 1860s hammerless guns were increasingly used in Europe both in war and sport although hammer guns were still very much in the majority. Source: Internet
However, the most successful hammerless innovation of the 1870s was Anson and Deeley's boxlock patent of 1875. Source: Internet
Swiss gunsmith Friedrich Martini devised an action that resembled the Peabody but incorporated a hammerless striker cocked by the operating lever with the same motion that pivoted the block. Source: Internet
Daniel Myron LeFever is credited with the invention of the American hammerless shotgun. Source: Internet
The most widely used British hammerless needle-fire shotgun was the unusual hinged-chamber fixed-barrel breech-loader by Joseph Needham, produced from the 1850s. Source: Internet
Hammerless shotguns The origins of the hammerless shotgun are European but otherwise obscure. Source: Internet