Smooth and customizable - JP Enterprises Gen 2 Silent Captured Buffer Spring System

Depending on your shooting preferences and the build you are working with, this option is one of the best upgrades I've done. Installed this on a carbine length with lightweight BCG and adjustable gas block. At first, my ejections we're wayyyy off, but because this has so many springs to accommodate for different BCG weights, as well as different buffer weights, I was able to get the best gas operation possible! The only downside is the time and ammo spent in getting to that optimal functionality.