Armalite and DPMS are just two to name a few for your big platform AR's. You can go the custom route and have a very nice firearm that will shoot bug holes guranteed. Look at Specialized Dynamics, Dedicated Technologies (DTech), and GAP just to get started naming a few. I just went through the same process. I am going with Specialized Dynamics. I have talked to Scott on the phone a few times and by email several times. He is building me a .260 that should be SWEET!!!!! I also have a 6.5 Grendel on the way built by him. All of these companies will build you a very fine 243. Good luck with whatever you choose
