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Step 6Barrel Support and Breech Loading
Barrel Support:
The barrel support works by boring out some of the PVC inside two 50mm PVC tee's. This allows the tee's to slide over 50mm PVC pipe.
Grab one tee and stick it in a vice so the horizontal ports are facing up. Find a hole saw that fits snugly inside the ports on tee. Attach the hole saw to a drill and drill out the inside 'lip' in the tee. The lip is a part of the tee which makes the diameter smaller. If you look inside a tee you will see this. This 'lip' stops the 50mm PVC pipe from sliding all the way through. We are going to try and remove it.
Take your time and slowly bore out the 'lip' from inside the tee, if it gets stuck, chuck the drill in reverse This shouldn't take too long, just make sure you are going straight.
Once you've done this to both of the tee's smooth out the inside with a curved file or sand paper. This allows the 50mm pipe to slide more easily.
Solvent weld the two tee's together by their bottom ports with a 7cm long piece of 50mm PVC pipe. Make sure they are perfectly straight and line up, both facing the same way. Now slide the bottom tee over the long 800mm piece of pipe coming from the stock. Try and push the tee far enough down this pipe so there is 4cm of the 800mm pipe sticking out the otherside of the tee. Line the two bored out tee's up with the tee solvent welded to the stock.
Breech loading:
For a 50mm PVC barrel, get one of the 50mm male threaded spigot adapters and solvent weld the 50mm PVC coupler to the spigot end (the end without threads).
For the golfball barrel take another 50mm PVC male threaded spigot and cut a piece of golfball barrel about 6cm long. Solvent weld this piece of golfball barrel to the inside of the spigot end on the fitting. You should have about 3cm of golfball barrel sticking out of this fitting. Solvent weld the coupler to that.
I'll come back to the breech loading later.
The barrel support works by boring out some of the PVC inside two 50mm PVC tee's. This allows the tee's to slide over 50mm PVC pipe.
Grab one tee and stick it in a vice so the horizontal ports are facing up. Find a hole saw that fits snugly inside the ports on tee. Attach the hole saw to a drill and drill out the inside 'lip' in the tee. The lip is a part of the tee which makes the diameter smaller. If you look inside a tee you will see this. This 'lip' stops the 50mm PVC pipe from sliding all the way through. We are going to try and remove it.
Take your time and slowly bore out the 'lip' from inside the tee, if it gets stuck, chuck the drill in reverse This shouldn't take too long, just make sure you are going straight.
Once you've done this to both of the tee's smooth out the inside with a curved file or sand paper. This allows the 50mm pipe to slide more easily.
Solvent weld the two tee's together by their bottom ports with a 7cm long piece of 50mm PVC pipe. Make sure they are perfectly straight and line up, both facing the same way. Now slide the bottom tee over the long 800mm piece of pipe coming from the stock. Try and push the tee far enough down this pipe so there is 4cm of the 800mm pipe sticking out the otherside of the tee. Line the two bored out tee's up with the tee solvent welded to the stock.
Breech loading:
For a 50mm PVC barrel, get one of the 50mm male threaded spigot adapters and solvent weld the 50mm PVC coupler to the spigot end (the end without threads).
For the golfball barrel take another 50mm PVC male threaded spigot and cut a piece of golfball barrel about 6cm long. Solvent weld this piece of golfball barrel to the inside of the spigot end on the fitting. You should have about 3cm of golfball barrel sticking out of this fitting. Solvent weld the coupler to that.
I'll come back to the breech loading later.
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