The selector issue is the dummy plug for right side isn't in place where you want it. It doesn't turn. To fix pull gearbox, out punch it in and press it back where you want it to be (or just black sharpie over the white mark)
The dust cover pin doesn't seem out of place. If the pin is through both sides of the upper receiver mounts, it's where it's suppose to be. The extra coming out the front end is suppose to be blocked from extra forward travel by the barrel nut
