i dont mean to thread-jack but for the sake of clarification:-
you actually want a hyper4 (aftermarket hyper3 with standard threads) reg. The DM7 uses a hyper2 which has standard threads. A hyper3 is DYE threaded (thread diameter is a lot slimmer than usual; only suitable for DM8 upwards, SLG 09/10, PMR 09 upwards, NTs). A hyper4 is a hyper3 with standard threads. In short, you need a hyper4.
having said that, the hyper2 reg is pretty much on par with the hyper3/4 so there isnt much point upgrading unless you feel it necessary to have latest upgrades on your marker.