From Halopedia, the Halo wiki
Unlike other Crawlers, this Crawler wields a Z-250 lightrifle which it holds in its front right claws as opposed to its mandibles. The weapon will clip into the ground often, and is most easily seen while using Promethean Vision.
- A similar occurrence of an enemy using a weapon they were not meant to use can be seen in Halo 2 in the form of the Needler Sentinel.
- The Lightrifle Crawler will occasionally have the model of an Alpha Crawler instead of the default Crawler type.