Angry Gun steel cylinder set for m40a5 sniper rifle

New CNC steel complete streght up full kit available
steel polished surface with better pressure and less friction
ventilated steel/aluminum piston with seal oring
steel made ball bearing spring guide
seal cylinder head with conical flow and dump oring
to install instead of the original aluminum part

parts included:
-steel cylinder
-steel/aluminum piston
-ball bearing steel spring guide
-steel silenced cylinder head

for marui m40a5 sniper rifle series