| Term | Definition | Category |
| 20/ | 20 Gauge | Caliber, Ammunition |
| 20/223 | 20 Gauge / 223 | Caliber, Ammunition |
| 20/243 | 20 Gauge / 243 | Caliber, Ammunition |
| 20/28 | 20 Gauge / 28 Gauge | Caliber, Ammunition |
| 204RUG | 204 Ruger | Caliber, Ammunition |
| 20M/22LR/243 | 243 / 22LR / 20 Gauge | Caliber, Ammunition |
| 20M/243 | 20 Gauge Magnum / 243 | Caliber, Ammunition |
| 20M/243 | 243 / 20 Gauge | Caliber, Ammunition |
| 20M/50BP | 20 Gauge Magnum / 50 Black Powder | Caliber, Ammunition |
| 218B | 218 Bee | Caliber, Ammunition |
| 220 | 220 Swift | Caliber, Ammunition |
| 222 | 222 Remington | Caliber, Ammunition |
| 22-250 | 22-250 Remington | Caliber, Ammunition |
| 223 | 223 Remington (5.56x45mm) 5.56 NATO | Caliber, Ammunition |
| 223WSSM | 223 Winchester Super Short Magnum | Caliber, Ammunition |
| 22-50 | 22-250 Remington (22 Varminter, 22 Wotkyns Original Swift) | Caliber, Ammunition |
| 22H | 22 Hornet | Caliber, Ammunition |
| 22LR | 22 Long Rifle | Caliber, Ammunition |
| 22LR/17M2 | 22 Long Rifle / 17 Mach 2 | Caliber, Ammunition |
| 22LR/17M2 | 22LR / 17Mach 2 | Caliber, Ammunition |
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