True, but they are physically new devices.<p>The B-52s are the <i>same planes</i> as were built in the 50s (not just the same designs. It&#x27;s true that there aren&#x27;t many parts in those planes that exist from the &#x27;50s, but and M-4 isn&#x27;t a AR-15 that was taken the factory and rebuilt - it is a brand new rifle.