I have the Magpul PRS on a precision AR 15. Yes, it is heavy! But, it is the most comfortable and adjustable stock out there for the AR 15/10. If you need the length, look at the Magpul MOE rifle stock. Same length as the A2 (rifle) and PRS. You will need the rifle buffer tube and S&W's spacer to use your existing buffer and spring.
chris