Specifications as to materials and parts in the manufacturing or assembling of firearms
Compiled text through Aug 15, 2022
Register checked through Jul 29, 2026
No later Register activity identified in this check.
Dates and status
- Compiling agency
- Executive Department
- Text status
- Source receipt
- Compiled text through
- Aug 15, 2022
- Register checked through
- July 29, 2026/Vol. XLVIII, Issue 30 (2026-07-29)
- Activity status
- No later Register activity identified in this check.
- Source snapshot
- Jun 6, 2026
All firearms manufactured or assembled pursuant to this Part shall meet the following material and parts specifications:
A basic structural component shall not be made of any material having a melting point (liquids) of less than 1,000 degrees Fahrenheit, and any material having an ultimate tensile strength of less than 55,000 pounds per square inch, and no less than eight percent minimum elongation in accordance with standardized metallurgical testing procedures.
After firing a proof cartridge, on visual examination, the barrel shall be free of cracks, bulges or splits.
After firing a proof cartridge, on visual examination each chamber shall be free of cracks, bulges or splits. Cylinder stop notches (bolt notches) shall be formed to ensure positive engagement of the cylinder stop at each position aligned with the bore.
After firing a proof cartridge, on visual examination, the slide material shall be free of cracks, bulges or splits; and the slide shall function throughout its full range of travel on the receiver (frame) guideways.
After firing a proof cartridge, on visual examination, the cylinder-frame or receiver shall be free of cracks, bulges or splits.
The barrel/cylinder gap is the space between the front face of the cylinder and the rear breech face of the barrel, across which the bullet passes upon firing. After firing a proof cartridge, the barrel/cylinder gap for all calibers shall be no greater than.010 inch, measured at each firing position.
The chamber diameter shall be no greater than.005 inch in excess of the minimum chamber diameters listed in Appendix K-1.