I’ve read that the Super 42 AR-15 springs were developed for DEVGRU and, along improving the lifespan, they all but eliminate the ‘twang’ in the stock tube.. At the same time the Sprinco springs with the various strengths are reputedly top shelf, but do they also reduce or eliminate the noise?

Am I correct that the Super 42 carbine springs will only work with a special Geissele buffer?