This review revisits the Kel-Tec RDB bullpup rifle and the Osprey 416 AR piston kit after years of use. The RDB is praised for its ambidextrous downward ejection, simple design, and mild recoil, though potential issues with clearing malfunctions and gas regulator adjustment are noted. The Osprey piston kit is deemed a functional, albeit niche, upgrade for AR-15s, despite the company's uncertain status.
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