CPVC Breech Build Guide!

Here is how I built a simple CPVC breech. It wasn't very difficult or time consuming, but you need to take your time and test fit the pieces carefully for optimum performance. It gives a single shot blaster with a 1/2" PVC coupler a better rate of fire without sacraficing range.
Here is What you need:

1/2" CPVC Barrel (barrel length determined by blaster used), 1/2" PVC sheath (no specific lenth), 1/2" long piece of 1/2" CPVC stub, 5/8" OD O-Ring (not pictured or needed, but highly recommended)

First, Let's make the sheath. Using a 5/8" drill bit (spade bit not recommended because it makes the hole slightly too large), drill out the inside of the PVC.

Now, outline a breech hole large enough for your darts:

... cut it out, and file/sand the hole smooth

Glue your CPVC stub into the rear of the sheath (PVC cement/solvent weld recomended)

And glue in your O- Ring if you are using one

O-Ring Recomended for better seal

Now Dremel out the inside of your CPVC barrel so that darts can be pushed in easily

And you're done! I recomend attatching string/wire to your breech so that the barrel doesn't come out all of the way for faster loading.

breech open

breech closed

Breech in singled Nerf Big Bad Bow

I also recommend making a breech locking tab similar to one that SG Nerf uses in his brass breeches to prevent the barrel sliding forward during firing (SG Nerf's brass barrel slide breech tutorial):