Wiitech metal hop chamber for Marui m870 shotgun (2016 Ver.)

New improved model made of CNC aluminum
Improved shape and pin housing according to 2016 MARUI modify of the M870..
Light weight and strenght durability instead of the plastic original version.

-More stability shooting
-More stable hop effect
-Avoid bb jamming

For Marui m870 shot guns and compatible.