I AM THINKING OF BUILDING A SDM RIFLE. THE LOWER IS A RRA WITH NM TRIGGER. WANDERING IF ANYBODY HAD ANY EXPERIENCE WITH RRA NATIONAL MATCH UPPERS OR LARUE NEW STEALTH SNIPER UPPER. BUIS WILL BE ARMS 40 AND EITHER YHM OR SAMSON APPRECIATE ANY INPUT.
Take a look at the custom build forum for info on the Stealth and other builds. I have done a build for a friend using the Stealth upper and LT 13.2 rail and the owner is very satified.
No experience with the RRA upper.