The transferable AR auto Sears, AND HK auto Sears, have appreciated more in value than ANY actual full auto weapons in the M16 or HK family. This is due largely to their versatility. If you own a registered auto sear, then you can own any number of "host" weapons in which to install them. Your weapons are standard semi-auto rifles/pistols until you install the sear. You don't/won't have to worry about wear and tear on a valuable registered receiver weapon. The Sears are virtually indestructible, and do not wear out.