GHK M4 Stock Buffer VS Viper Tech
OptimusPrime
15 Jan 2015
Check this video out from BadaBing Pictures... "A quick video comparing the stock GHK buffer spring and Viper Tech Recoil Spring. The overall difference between the two springs maybe only slight, the Viper Tech spring has proven to be a decent upgrade for the GHK M4, chosen by many who run the platform."