Depends on what you want out of your rifle. I like to keep my ar15s light and maneuverable, so I'd go with a ballistic advantage Hanson in the lightweight profile. I'm assuming you already have a factory chrome lined MRP barrel. The lightweight BA Hanson should shave about 10 oz compared to the factory LMT barrel. If you don't want light weight and are looking for more accuracy/precision, I'd pick up a white oak armament or a bison armory. The WOAs go on sale from time to time for around $200. And the bison armory is always 200. The bison and WOA are well regard for accuracy for the price. And the BA is very reasonably priced for the features it has and I never see people complain about accuracy, so it should be sufficient for what it is. I'm actually going to pick up a lightweight Hanson barrel for my MRP and have it converted, I just can't decide if I want the 14.5 or 16.