The practice of locating natural gas and petroleum deposits has been transformed dramatically in the last 20 years with the advent of extremely advanced, ingenious technology. In the early days of the industry, the only way of locating underground petroleum and natural gas deposits was to search for surface evidence of these underground formations.
Thumb Safety. No, the problem with a Thumb Safety is it's a Minor Motor Skill the way your brain see's it. Under a stressful situation you may loose all minor motor skills. All my guns I train with and I train consistantly, do not have any safeties.
Drop Safety. The rear part of the trigger bar, which has a cruciform shape, rests with both arms on the drop safety shelf located in the trigger mechanism housing. When the trigger is pulled to the rear, the trigger bar begins to move down off the shelf until finally separating from the firing pin lug.