[supercat]

What a moronic statement. It has been well known for over 160 years, since Sam Colt invented the revolver, that you always have the hammer over an empty chamber. You load five in a sixshooter.

On NAA revolvers, the cylinder is designed so that the hammer may be lowered between cylinders. Anyone know when that feature was invented? Seems like an obvious improvement to increase a gun's usable capacity with minimal extra cost and no downside that I can see.

[Inyo-Mono]

Colt first added safety "pins' between the chambers on Colt's revolver cylinders for the hammer to rest on in the 1840s (Dragoons, Navys, and pocket guns) . The pins had a tendency to wear out after time. Remington improved on the idea with 1858 Beals Model .44 which feature actual notches between the chambers which the hammer could rest in.

Having owned, carried and shot replicas of all of the above cap-n-ball revolvers I can say that the Remington was of superior design, and indeed was the forerunner of all modern revolvers including the famous Colt .45 "Peacemaker" first introduced in 1873.

[Swordmaker]

On NAA revolvers, the cylinder is designed so that the hammer may be lowered between cylinders. Anyone know when that feature was invented?

That feature existed on the 1847 Colt Walker... and all percussion Colt's that followed.