Right now I have a bushmaster varmint ar15 in .223 and its an awesome gun. Shoots right with my bolt guns but with the heavy 24" barrel and the 6x18x40 leupold its a little heavy and awkward for calling coyotes. I was wanting to get another upper in maybe a 16" or 18" standard contour barrel thats a little more handy for close in shots. Maybe mount a red dot sight or lower power scope on it. I'm not sure if this is a lot to ask but I still want it to be an accurate rifle, at least 3/4moa accuracy at 100 yards. Can anyone recommend who makes some good uppers and any experience you have with them. Any input welcome. Thanks!