Spike's Tactical lowers are American-made to the highest standards. The 7075 T6 forged aluminum has a MIL-A-8625F Type III Class 2 Hard Coat Anodized finish. This stripped lower is multi-caliber, and low shelf, RDIAS compatible. The Spider model features the ST Spider Logo predominantly on the left side of the magwell. The Spider model is the standard lower on all ST-15 LE rifles. The selector markings on this Spider model are bullet pictograms. It has a black finish. NOTE: Requires a lower parts kit, buffer & stock of your choosing to complete.
| Manufacturer | Spike's Tactical |
| Model | Spider |
| Caliber | Multi |
| Type | Receiver |
| Action | Semi-Auto |
| Color | Black |