Originally Posted by ThunderCactus
Aluminum. With double o-ring groove on the outside and inside.
Unless you have a metal turning lathe, you won't be able to make an accurate spacer. Especially since you can buy REALLY high quality ones for like 12$
Oh ok, thanks.
Also, it said that most have o-ring on both inner and outer of the spacer, so does that mean pulling out the barrel would very difficult?