(of a firearm) having the hammer concealed within the receiver.

1870–75; hammer + -less

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World English Dictionary
hammerless (ˈhæməlɪs)
(of a firearm) having the hammer enclosed so that it is not visible

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Among the prizes will be a hammerless shot gun of approved type with all accessories.
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