SRT (Sound Research Technologies) Arms submitted several sound suppressors to an Army competition to find the best off-the-shelf suppressor for the M9 pistol. Most suppressors submitted to Picatinny Arsenal featured a recoil regulator to temporarily negate the inertia of the suppressor, which can inhibit the extraction and ejection sequence. SRT’s Matrix M9 suppressor did not include a regulator. That was a bold move.
Most centerfire pistol suppressors being fielded today include a recoil regulator to ensure reliable functioning, especially when the pistol is dirty. SRT’s design goals were simple: offer the simplest, shortest, lightest, most maintenance-free and economical suppressor that can meet the design and performance criteria established for the competition. Eliminating the regulator was the easiest way to achieve that.