
Open it up.

Take out the whole assembly.

Exploded.

Throw everything away besides the plunger chamber (the first air-restrictor piece is glued in, atleast on mine). Then fill in the sides of the orange piece at the end with plumbers goop.

Then drill out the middle. You might want to leave a little bit more on the sides than I did, just to make the next step easier, and to ensure you don't shove a dart into the plunger chamber.

Now take a ~1" 9/16" brass stub and glue it into the AR-piece you just drilled out. If you left a little more on the side this will ensure you don't shove it too far into the plunger chamber.

Now you can add a 17/32" brass barrel, I recommend 4", and either glue it in or leave it removable so you can rear-load it.
Now take out the plunger rod.

You can add any spring or replace it, but I just added a tek-1/6/10 spring.

I also added some e-tape underneath the o-ring to make a better seal, about half way around.

I also minized the shell, which is extremely easy and looks very good. Almost like it was meant to be.