K, I know this is probably gonna be a stupid question for most of you but I'm new to this and just wanted to know. . . I recently asked a question about getting a mini14 or an AR and I found a heck of a deal on the AR. . . So my question, I wanted a truck gun that is reliable and efficient. The Bushmaster AR I found is a nice gun. Great reviews. But it's the varmint rifle. 24" Barrel. Is there a way to cut the barrel down without affecting accuracy or messing the rifle up all together.? I want it no longer than 18".