You can find the Armaspec Stealth SRS Buffer Tube Kit Carbine Gen4 here Fast $9.95 shipping! Orders over $200 ship for free!
The Armaspec SRS Enhanced Buffer Tube Kit contains all the necessary parts required to mount a stock assembly on to a lower receiver. The kit contains a Mil-Spec 7075-T6 6 position buffer tube, a steel castle nut and end plate and features the Armaspec Stealth Recoil Spring (SRS) GEN4 enhanced multi stage recoil buffer system. The Stealth Recoil Spring Gen4 is a self-contained multi-stage drop-in replacement for the buffer and spring. The Stealth Recoil Spring keeps the buffer spring from rubbing against the buffer tube providing smooth, quiet operation while the second stage helps reduce the felt recoil significantly. The buffer mass is always under constant tension against the bolt carrier. Compatible with AR-15 with carbine-length buffer tube. Made in the U.S.A.
Buffer Weight: 3.3oz (Carbine)
Length: 7.18"
The Stealth Recoil Spring is available in 7 variations with an equivalent buffer weight:
SRS-Carbine: 3.3oz
SRS-H: 3.8oz
SRS-H2: 4.7oz
SRS-H3: 5.6oz
SRS-BB: 5.3oz (For .458 SOCOM/.450 Bushmaster/.50 Beowulf)
SRS-9mm: 6.4oz.
SRS-308: 5.7oz
Actual Wight - Complete System (new version with stainless steel weight):
SRS-Carbine: 6.2oz
SRS-H: 6.6oz
SRS-H2: 7.4oz
SRS-H3: 8.0oz
SRS-BB: 7.5oz
SRS-9mm: 9.5oz.
SRS-308: 7.09oz