| 1 | Rifled firearms date at least to the 15th century. | |
| 2 | It was rare, she said, rifling through a patient's tattered record. | |
| 3 | Rifled unique design, so that the longer range gun, shot a higher high. | |
| 4 | In 1635 the word rifle appeared in English in a patent for cutting these grooves in gun barrels. | |
| 5 | New Method for Measuring the Rifling Angle of Artillery Pipe Based on Template Matching . |