Griffin first made over the barrel suppressors over ten years ago with the introduction of the RSTA and SPR models. Meant to diminish blow back, provide superlative accuracy, excellent POI shift characteristics and add minimal system length, these suppressors were highly desirable among suppressor aficionados. Griffin is reintroducing next generation over the barrel suppressors with the DUAL-LOK PSR suppressor series. However, before going into detail on these models, a brief discussion on the history of reflex suppressors is warranted.