Smooth and affordable - Armaspec AR15 GEN4 H2 Stealth Recoil Spring Buffer Kit

You get the value for money on this one. The carbine tube sits snug with with my Daniel defense stock. Racking the charge handle feels more smoother than the conventional spring. It's noticeably more quiet. Shot 200 rounds without any malfunction. I'm running an H2 weight with a 14.5" barrel with a 1.5" compensator and I didn't notice any improvement on recoil.