The Specna Arms PRIME™ AR15 model lower frame is made of all-metal and is compatible with the ESA2.1™ (2024) quick-change spring system. The updated quick-change spring system significantly improves the durability of the rear part of the lower frame compared to the ESA 2.0 model.
The frame is fully compatible with the Edge and Edge 2.0 series upper frames.
Package includes:
- ESA 2.1 spring guide
- Fire selector plate
- Shell ejector window flap
- Pin (front/rear)
- Bolt catch
- Bolts
- Trigger pin
