I have been looking into AR-15 rifles. I would like to add one to my collection just for the sheer fun of shooting it and for coyote hunting. It sounds like the varmint barrels are producing very nice accuracy. The question I have concerns the manufacturers. Colt, Rock River, Bushmaster, and Olympic Arms to name a few. I really wouldn't know how to rate these company's quality and/or accuracy wise. Does anyone here have any experience with the companies mentioned, good or bad. I would appreciate hearing your experience and/or comments. Thanks.