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(Firearms, Gunnery, Ordnance & Artillery) (of a firearm) having the hammer enclosed so that it is not visible
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhæm ər lɪs)

(of a firearm) having the hammer concealed within the receiver.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
3 and Safety Hammerless (the "Lemon Squeezer") revolvers, Harrington & Richardson's Hammerless revolver and Iver Johnson's Safety Automatic revolver.
Think of classics like the Schofield and Model 3 as well as the Safety Hammerless designs affectionately--or perhaps derisively--nicknamed "lemon squeezers." Ingenious as those auto-ejecting top breaks were, there was a limitation to the design: Since the frame wasn't solid it placed a ceiling on the power of the cartridges it could handle.
I believe it to be a Smith & Wesson .32-caliber, Safety Hammerless revolver.
The Levermatic was hammerless and designed with a short action and very short lever throw which takes some getting used to for those of us raised on standard (and far smoother) Marlins and Winchesters.
Aimed at Volvo's larger excavators and wheel loaders, the new generation Volvo Tooth System features higher penetration, longer life--and an easy hammerless fitting system.
All are hammerless with a long double-action trigger pull, firing first one barrel, then the other.
The most unique features of this model are its hammerless operation and innovative safety/ cocking mechanism.
Johnson, and was one of the first hammerless pump guns.
The CZ-USA Sharp-Tail Coach is a hammerless version of the company's popular Hammer Coach.
Among the new products and services to be presented is the new Maintenance Kit for excavators, which offers a saving of up to 15% on the total value of the included parts; the SmartFit patented tooth system featuring hammerless fastener technology, which improves machine performance with teeth that stay sharper longer and penetrate deeper; and a new range of Simileo and Microfibre fabric seat covers that combine functionality and style.