JP Enterprises Silent Capture Spring

[Tedward]

You can get your self a set of CS springs, and never worry about them again... Extractor, ejector and buffer would run you $40-50, and last you, your kids, and your grandkids the rest of their life.. Rated for Five hundred thousand (500,000) compression cycles at maximum performance...

Like this: http://www.davidtubb.com/ar-15-buffer-sp...ne-and-std

Good info.
Wonder what kind of spring JP uses? Since they have such a good product and the price they are, wonder if it is of this quality and not the $4 buffer spring.