
One pipe is sights outside profile CNC machining, placket, the middle button, after the cylinder shell, connected into a whole profile, a lot of time turning (some sights will choose a stamping), not relying on the thread splicing.
| Model | BM4202 IR |
| Specification | 3 - 9×42 IR |
| Magnification | 3 - 9 |
| Objective lens diameter (mm) | 42 |
| Field of view at 100 yds(ft) | 42.0 - 13.94 |
| Exit pupil (mm) | 14 - 4.67 |
| Eye relief (mm) | 115.5 - 91 |
| Click (in) 100yds | 0.25 |
| Tube Dia (mm) | 30 |
| Length (mm) | 338.9 |
| Weight (g) | 666.8 g |
| Lens Coating | Fully Multi |
| Reticle | Mil-Dot (Customize) |
| Reticle Texture | Optical glass |
| Lighting system | Red,Green |
| Battery | CR2(3V) |
| weather proof | Yes |
| Waterproof | Yes |
| Nitrogen filled | Yes |