Just a quick post to let evreyone know that LWRC's customer service/tech support is 1st rate. I have a 20" REPR and I decided to change out the PRS for a UBR. They took great care of me and gave me a 10% LEO/Mil discount, and sent the bits via FEDEX 2 day air. When I learned that the guy who helped me with my initial order erred when he told me I didn't need the carbine-length buffer spring, I called them and they sent me the correct spring at no charge. LWRC's rifles are top-notch and so is their service.