Try loading and shooting with 9 in the mag instead of 10. The mag may not be seated fully. Make sure it is seated fully and you might even try inserting the mag with the bolt back and out of the way to ensure that it does.
As far as the scope rail, They usually come packaged individually inside the box on a brand new rifle, and I suspect it was probably installed by the store where you bought it. Probably just needs to be installed and tightened correctly.
Bookmarks