Both of those guns you mentioned have lots of problems , even the mk2 r10 , my brand new Daystate regal has been back to Daystate 3 times and the gun shop told me they send back a lot of regals . I would not buy a TV screen to go on top of my guns, I hate them ,have a look at some of the new NV kits coming out and look on the Nightvision forum , some good information on the site about different NV set ups