Olympic Arms got a bad reputation years ago. Olympic made a low-cost AR with cast upper and lower receivers years ago that gave their reputation a black eye. Lots of people bought them because of low cost, then whined and complained when their low-cost rifle would not take standard AR15 parts (mainly trigger pins) and the finish scratched easily.
Olympic has quit offering those rifles, and offers rifles built of high-quality forgings and put good barrels on their rifles. Several people I know shoot them in Service Rifle matches with no issues. Although I do not own one, their rifles appear to be well built and of good quality. They come with a lifetime warranty, and you don't give out lifetime warranties on poor-quality products, it is too expensive.