This test shall consist of the firing of one proof cartridge in each chamber. Each proof cartridge case shall be visually examined after firing to ensure there are no splits or other defects indicating firearm failure.

This test shall consist of firing 1,000 rounds of commercial ammunition. Failure shall not exceed the number listed as permitted in Appendix K-2. Firing shall be in series of not more than 500 rounds. The sample shall be cleaned and lubricated at least once during each series. The safety shall be tested at the conclusion of the test to determine that it functions as intended. Malfunctions caused by failure to clean and lubricate, or by defective ammunition, shall not be counted against the sample.

The safety device on a pistol or revolver (single- or double-action) with an exposed hammer must withstand the impact of a weight equal to the weight of the firearm dropping from a distance of 36 inches in a line parallel to the barrel upon the rear of the hammer spur, a total of five times. Breakage or deformation which renders further firing impossible and which is not accompanied by discharge is considered satisfactory performance. This test is to be performed after the successful conclusion of the endurance test.