【D.craft】BARREL EXTENSION12 SUS type1 's Japan Review

Used with O-ring over it.
No problem in practical use, especially no loosening.
I prefer a back center of gravity, so I tried it instead of a metal shaft.
I thought it would be good for changing the balance of the barrel or for a change of pace.
This time, I bought only the ring-cut type 2 because it was sold out.