| CALIBER QUANTITY PER RIFLING TURN | 1 TURN IN 326.571 CALIBERS TO 1 TURN IN 25.916 CALIBERS |
| FSC APPLICATION DATA | CANNON,20MM,ANTIAIRCRAFT GUN |
| GROOVE WIDTH | 0.201 INCHES MINIMUM AND 0.209 INCHES MAXIMUM |
| LAND WIDTH | 0.082 INCHES NOMINAL |
| OVERALL LENGTH | 59.843 INCHES MINIMUM AND 59.968 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-46047 MIL SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL UNS K14185 |
| RIFLE BORE GROOVE QUANTITY | 9 |
| RIFLING DIRECTION | RIGHT-HAND |
| SIZE DESIGNATION | 20 MILLIMETER |
| SPECIAL FEATURES | BARREL HARDNESS,ROCKWELL C SCALE 32 TO 37 |
| WEAPON MODEL NUMBER | XM168 |
| WEAPON SIZE DESIGNATION | 20 MILLIMETER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-C-320, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE INSIDE |
| SURFACE TREATMENT | PHOSPHATE MANGANESE LOCATION NOT OTHERWISE SPECIFIED |
| SURFACE TREATMENT | CHROMIUM INSIDE |