RA Tech's Winter Type M4 Recoil Spring is a lighter spring for the M4 buffer tube that operates on reduced pressure from the bolt, allowing for correct operation even in cooler weather.
The RA Tech Recoil Spring fits all types of GBB M4, including the Western Arms, WE, Inokatsu, and KSC and KWA versions. These allow for nominal operation even in cooler temperatures with reduced gas pressure, and resists cool-down effects during strings of fire.
RA Tech Winter Type M4 GBB Recoil Spring Features:
-Fits all M4 GBB
-Enables Proper Operation in Low Temperature