Jones under lever is slower to operate than a top or side lever gun, but is very strong with two bearing surfaces and a positive direct lock up you control in plain sight. Obviously, if hammers are outside you have to cock them to fire, if internal they stay cocked and rely upon the safety. Hammers can be rebounding or not. Non rebounding hammers usually have a half cock which serves as sort of a safety and eases final cocking by taking up part of the spring tension. Rebounding automatically stand clear of the firing mechanism and require a full cocking movement to get into battery. Either hammer mechanism can result in a premature fire when your hot sweaty thumb slips during cocking...Geo
