These take the Defender series and add:
Barrel & bolt upgrades
- Chrome lined and phosphate coated barrel
- NP3 coated bolt with Carpenter 158 (5.56/300 Blackout)
- Dual ejector bolt
Rail & sights
- Quad-Picatinny rail
- Optional polymer flip-up sights for use in conjunction with optics and electronics
Buffer
- H1/H2/H3 buffer weight as necessary
- Most configurations move to H2
