JP AR-15 Heavy SCS Kit 5 Spring Weights, Silent Captured Recoil Spring, Heavy Mass Version, Gen 2

GEN 2 AR-15 Silent Captured Spring Builder with Alternative Spring Pack
H2 Buffer Version

Includes SCS unit, five alternative weight springs and spacer to allow for installation in both carbine- and rifle-length buffer tubes.

Recommended Use:

Short-barreled rifles (SBRs)
Suppressed weapons
Rifles recommended to use an H2/H3 buffer
Select-fire rifles
Piston-operated rifles