When a Reflex mount cannot be utilized, flush mounts are available to accommodate a wide variety of firearm styles.  Available in 1/2 x 28, 5/8 x 24, 3/4 x 24.  Custom threaded mounts are available at no additional cost, but do come at an increased lead time.  Fits the AB Suppressor Raptor Series and CZ-USA Ti Reflex.