Modshop – RSCB

Right, a somewhat continuation of the last post in that this RSCB was originally intended to go on the TripleShot we did last week. The RSCB is an amazingly simple device that doesn’t get anywhere near as much credit as it deserves. A sort of inline clip if you will, it allows you to fire darts relatively quickly, yet still retain impressive power. It’s easy to make, easy to use, reliable, efficient and effective. Today’s post will walk us through not only the construction of one, but also the theory behind it.

Here’s one I prepared earlier attached to a BuzzBee Ultimate Missile Blast (BBUMB). In TLDR form, the RSCB works by recirculating air up from the blaster nozzle, through the T-piece, bouncing off the end cap at the cap and pushing a dart through the barrel and out the front. After re-priming the blaster simply flick it downwards quickly, forcing the next dart line into a funnel just in front of the T-piece and reloading the blaster. In this case I chose to use 30cm of 17/32 brass tubing protected by an outer covering of PVC pipe. You can use practically any barrel material you like in an RSCB, but it’s effectiveness heavily dependent on the blaster that’s powering it.


Ok, now on to the construction! To make an RSCB you will need the following tools/materials….

15mm PVC pipe (50cm would probably do you but 100cm would be better)
15mm PVC T-piece, right angle bend and ball valve
Dremel, complete with cutting and grinding tools
PVC solvent
Hot glue
Electrical tape
Some variety of barrel material, depending on the blaster in question

The one I’ve made here was specifically designed to be able to go on a number of different blasters, so I’ve left the end as 15mm PVC so it can connect to a coupler. You can however attach it directly to the output of the blaster if you never intend to change it.

Here are the parts as mentioned.


Start by cutting three lengths, each roughly 40mm long. They don’t have to be exact but they should be better than what I’ve pictured. I didn’t realise how short the one on the left was until I took this photo. That one was thrown back in the parts bag and another one cut.


Apply a liberal coat of PVC solvent to both the inside of the right angle bend and one section of pipe, leave it for about 30 seconds or so, then join them together.


Do the same with the t-piece on top of the right angle bend. Be careful to make sure that the two backwards facing openings are perfectly aligned. If you’re lucky, your fittings will have mold lines that make it easier to line up.


Grab another small section of pipe we cut earlier and glue it in the other end of the right angle fitting. This is what we will use to connect to the coupler on the blaster, so feel free to skip this step if attaching directly to the blaster.


Cut another section of 15mm PVC, the length of which will depend on how many darts you want to be able to load at once. The downside being that the longer the ‘clip’ is, the more power that will be robbed by the RSCB. In this instance I was aiming for an RSCB that could be used on an assortment of blasters so I went with a length of 400mm, allowing for 6 darts to be loaded.

Glue it into the back of the t-piece.


Grab the 15mm ball valve and mark the point where the pipe mounting point ends.


Then make a cut. We want to get relatively close to the ball itself, but make sure you don’t hit the ball.


Glue it to the back of the assembly. Come back once it’s dry, close off the ball valve, cover up the bottom entry and blow into the front. If it’s air tight, we’re good! If there’s a leak, plug it with hot glue!


Pick your chosen barrel material and nest it within some 15mm PVC, with roughly 5mm extending past the barrel. Grab the grinding attachment on your Dremel and grind a funnel into the end of the PVC. We need to end up with a gradual funnel that forces darts into the smaller barrel. Catch is, no photos yet sorry as I haven’t actually figured out which barrel material I want to run on this one yet. Tried a bunch but can’t seem to make my mind up 😦


This is where I’m unfortunately going to leave it for the moment.


So instead we’ll jump back to one we prepared earlier!



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