Primary Arms SLx MD-21
| Series | SLx MD-21 |
| Optic Type | Red Dot |
| Magnification | 1 |
| Reticle Color | Red |
| Reticle Size (MOA) | 2 |
| Solar Failsafe | No |
| Shake Awake | Yes |
| Night Vision Compatible | Yes |
| Enclosed | No |
| Battery | CR2032 |
| Optic Removal for Battery Change | No |
| Mount Type | Fixed |
| Mount Height | Absolute Co-Witness / Lower 1/3 |
| Mount Height (in) | 1.41 / 1.535 |
| Material | Aluminum |
| Weight (oz) | 5 |
| Average Price | $180 |
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