Dummy breacher choke for Tokyo Marui M870 Breacher airsoft shotgun

*Important*
This is intended for airsoft purpose only. Do not use it on any sort of firearms.
Description:
A dummy breacher choke for TM M870 Breacher airsoft shotgun. This design is not tested on the TM M870 Tactical, there is a possibility BB will hit the choke before leaving the barrel.
Extra material required:
none
Extra modification required:
none/reversable
Step to install:
1. Just plug it into the muzzle.
2. When removing the choke, gently twist to both side while p