All my four distinctive optics are all QD both from employing ARM’s #63 mounts or such as Vortex holo sight and there 6x flip magnifier have interior QD bases. one other advantage of the spuhr is a chance to use any buffer. I mounted a hk m21e buffer in mine. https://pulsa30382944.blogunok.com/31895816/an-unbiased-view-of-situs-kasino