Both kind of spectacles issue with clear and grey lens, Crossbow takes part in APEL list (I’m not sure if Crossbow Suppressor takes part, although it was assigned an NSN code).
Crosshair has better compatibility using with helmet or headset, since it’s frame is thinner than Crossbow.
Stock Number Reference:
| Name | NSN | Assign Date |
|---|---|---|
| ESS Crossbow | 4240-01-583-5742 | 2010-03-30 |
| ESS Crossbow Suppressor | 4240-01-594-0564 | 2011-04-22 |
| ESS Crossbow UPLC Compatible |
4240-01-630-8327 | 2014-08-20 |
| ESS Crosshair | 4240-01-630-6352 | 2014-08-12 |
Reference: ESS Official NSN List (PDF)（2010-08）