These fit fine, work properly. - Armaspec Buffer Retainer w/Spring

Just trying to bring this unjustified low rating up. I have reviewed this before, but I have purchased more since the last review. I have had zero issues with these not fitting properly. They fit my Aero Precision mil-spec lowers just fine. I think the reviewer who gave a low rating may not be doing something right? Did you unscrew the receiver extension to install? Is your lower not mil-spec? After using many of these, I can not understand any fitment issues.