I've been looking around for chrome silicon carbine buffer springs but everyone I found was $10.00 or more a piece. Then I checked Amazon and found a set of 5 for $23.00 from KAK. I went to KAK's website and saw they had the set on sale for $15.00, so I bought them. I'm curious to see what the look like and how they perform, but at that price even if they're no better than ss springs I probably haven't lost anything.