I am going to be buying an AR-15 rifle, It'll be my first and was wanting some opinions on Manufacturers and if there really is a best option for parts. I do only have one requirement and that is that it be worth every penny I spend on it. I looked around through them and my 3 preferred options are the Colt M4 model with the 5.56 round, a Smith and Wesson version, and then the DPMS with the 6.8 I picked these because I know Colt and S&W i own other guns of theirs and have had no problems. The guy did say that Colt M4 uses special parts that you can only get from Colt, and the DPMS I know comes in a 6.8 a round that i have heard good things about. Regardless of what it is chambered for and which brand it will get free-floating quad rails and a new flip sights foregrip and a quick release scope, I'd like it to be able to reach out about 200-250 yards with a decent cluster. I am just looking for some advice to point me in the right direction for making a good choice and any recommendations on other manufacturers are welcome.