Guntec usa ar-15 a2 buffer spring set - Guntec USA AR-15 A2 Buffer Spring Set

This is a good solid product at a fair price. Fit and finish are excellent. This is a standard quality spring, not a high end polished spring, that being said, it functions just fine in my rifle, without undo twang noise. I would use this again in any build requiring a rifle length A2 set in this price range. This will get you to the range at a fair price.