I don't have an AR15 yet and have been looking at the AR pistols in 5.56 with 10.5 inch barrel. As a fun gun that will not see over 100 yrd shots, I am leaning towards one instead of a full length rifle. With a can to throw the flash and sound forward, they seem to be a nice option to a full size rifle. Therefore, I don't really need the extra length barrel and being shorter will be easier to carry in my sports car. Sight radius shortened would be my only concern thus far. What are your thoughts on one of these instead of a 16 inch plus rifle for my first AR?