%20to%20the%20KSG%2012%20gauge%20shotgun%20pump%20action%20and%20now%20the%20RDB%20(Rifle%20Downward%20Ejecting%20Bullpup).%20The%20RDB%20is%20chambered%20for%205.56mm.)
Bullpup 556 Kel-Tec RDB So Is It Any Good?!?!
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‘Unobtanium’ has been used to describe many Keltec weapons from the PMR-30 full size pistol chambered for the flat-shooting .22Magnum cartridge (.22WMR) to the KSG 12 gauge shotgun pump action and now the RDB (Rifle Downward Ejecting Bullpup). The RDB is chambered for 5.56mm.