The Kel-Tec RDB Defender 5.56 NATO bullpup rifle uses an unrivaled downward ejection design that sends spent brass through the stock behind the magwell, eliminating side-ejection concerns for left or right-handed use. This keeps hot gas and brass away from the shooter and supports fast shoulder transitions without disruption. The trigger is described as incredibly smooth with a clean take-up and break, giving the rifle a refined feel compared to typical bullpup designs.

The Kel-Tec RDB Defender 5.56 NATO bullpup rifle utilizes a 16.10" pencil profile barrel with a 1:7" twist rate to stabilize a wide range of projectile weights common to the caliber. This tan bullpup 5.56 rifle that accepts AR-15 magazines offers a compact footprint while maintaining full-length barrel performance for improved velocity and effective range.