from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
from The Century Dictionary and Cyclopedia
- Having no hammer or no visible hammer: applied, specifically, to a breech-loading small arm in which the cartridge is fired by the action of a firing-pin or a concealed hammer.
Sorry, no etymologies found.
He took out a pistol and glanced at it. .38 hammer-less.
A doubtful bag doesn't matter -- it's a new country and I feel as keen as a cockney on his first 12th -- so I unpack my American automatic five shooter, beside which all last year's single-trigger double-barrel hammer-less ejectors are as flintlocks!
I've been to a few guns show lately and have looked a titanium hammer-less Taurus.