I would ignore the gap. A gap is more useful than most people can understand. In some firearms a gap can spell trouble but not always. If you end up in a disaster situation, like New Orleans and Katrina, then that gap might come in handy to help drain off water that gets into the rifle. Same thing if you end up with a lot of dust, sand or dirt in the air. A little bit of gap can sometimes be a good thing if you understand it. As long as your accuracy does not suffer from it, don't mess with perfection. But it is YOUR RIFLE, not mine. YOU, not me, are the one who has to use that rifle and make it work/feel comfortable for you. Do what you think is right.