LR-308 parts are very confusing. There are a number of standards, and many of the parts are not interchangeable. I would only use parts that are specifically “LR-308” or “DPMS” compatible. Palmetto State Armory PA-10 kit’s are a notable example of a kit that is not compatible, the bolt hold open lever is the wrong size to work with my LR-308 lowers. I would recommend using lower parts from KAK, or just pick up one of my 308 Combo Kits.