If you have the luxury of shooting the 15-22 at an outdoor range at 50 yards you may discover that it is already zeroed it or close to it. If you’ve reviewed the owner manual then you already know that the A2 front sight is not mentioned in the sight adjustment section. Instead, it directs the owner to adjust elevation and windage with the rear sight. If you’re shooting the rifle at a shorter distance on an indoor range you may find that you can’t adequately zero the rifle with the OE sights. I personally use a red dot when shooting inside. Enjoy your 15-22.