1/2" Sch 40 PVC
9/16", 17/32" brass pipe or whatever barrel material you prefer.
Here is your stock SM1500. Unscrew everything.
See that orange piece, remove it with a knife or a screwdriver.
At the end of the gun there would normally be an orange cap, remove that piece just like you did earlier.
Separate your shells and remove the plunger from its chamber. Then hot glue the release valve and all the tiny holes on the sides of the plunger. Wrap the o-ring a couple times with telfon tape. Wrap some electrical tape on the teflon below the o-ring to ensure that that the teflon stays in place.
Apply hot glue liberally to both the spring and the plunger rod. This moves the plunger rod back quicker when you pull the trigger allowing for air pressure to be released more efficiently.
Here I cut a 3/16" by 1/8" rectangle out of both sides of the shell this allows for the trigger mechanism to be pulled back further.
Remove those two screws and take the black piece of plastic off. Keep the black piece as it will be very useful later on.
Cut off your barrels and sand the surface so that it is relatively smooth.
Sand down the black piece until you are able to place PVC at a 90˚ angle into all four barrels. Screw the black piece back on once you have done this.
Once you've sanded the black piece, wrap your brass barrels in electrical tape a couple times at the bottom and about an inch below however long you want your barrels to be. I choose to have 8" barrels. Twist your pipe inside of the PVC until you reach the bottom, and then cut your barrels.
Glue all of your barrels to the rotatory and the seams between the black piece and all of your barrels. Reassemble everything. Congratulations, you now have a powerful primary with a great rate of fire. I named it Vera because like Jayne's Vera, mine has a tendency to shoot smoke when fired. Comments? Suggestions?
Edited by Homestarune, 21 February 2009 - 12:43 PM.