Ok I know of the MK18 and MK12 rifle’s but are there any other AR’s in this series Im unaware of?
Oh yeah pic’s would be nice if you got them 
there is the MK11 but that is a SR-25 not a AR15 based rifle
Grinch I forgot about the MK11 but then your right its a 308 platform .
Over at arfcom they’ve got the MKm. That’s any AR15 decked out in Magpul and KNS accessories.
Niiiiiiiice!!