SHS Recoil action kit for m4 electric gun

Full metal set with blowback simulator action
aluminum main body with hard floating mass and recoiler
steel piston connector with ball bearing spring guide
recoil spring for floating piston mass return
transaxle dedicated stock screw

the set can be installed very easely into m4 stock pipe for slide stocks
by kinetic energy transfering the system give extreme realistic recoil feeling to the user gun stock
the device have energy transfer delay that will not reduce the accuracy shooting
for Marui and compatible m4 with slide stock

THE SYSTEM NEEDS TECHNICIANS AND SOME EXPERIENCE TO BE INSTALLED
PERFECT FITS INTO STOCK PIPES MADE BY: KING ARMS, MARUI, DBOYS, ETC.......