My new MP40 was bought first and foremost to be my home defense weapon. I should have ordered it with night sights but I didn't cuz Bud's didn't have the version WITH night sights and WITHOUT mag safety, so lo and behold I need a set. After some research I've decided on the XS Sight Systems 24/7 Express Big Dot. Having said that, I spoke with the folks at XS today to inquire when they would be available for the MP, but learned something interesting in the process. It seems that for technical reasons relaed to the MP slide, XS can't design the MP site system with nights sites on the rear; in other words, the front sight will be the only one of the pair with Tritium. Is this a problem?