Hubb

He may be talking about pex tubing. It is pretty close to the designated size and has different colored marks on it (which generally are for determining the different sizes). Standard pvc pipe (be it sch40 or 200psi) is generally white with black lettering. Gray PVC pipe is generally Sch80, which is much more sturdier than the other two. PVC conduit is usually gray as well, but is Sch40, so it won't be really flimsy as he describes. And, for the record, Sch40, Sch80 and 200psi (or SDR) all have the same outside diameter.

If he is actualy talking about 3/4" pvc pipe, then see the post above mine. This would indicate to me that the person who put together this guide really doesn't know what he is talking about, and, therefore, may be full of crap on the entire thing.

Is the guide talking about CPVC? 3/4" CPVC has an OD of .875 (1/2" is running .625). CPVC is probably better suited for the darts anyway, as it will be closer to the right size.

Honestly, seeing the guide will help.

It's a constant force spring. When the end is pulled, the tension wants it to return. By hooking the end portion to the top of the magazine and having the coiled portion under the follower, it will allow the follower to push down (and unwind the spring) in a constant force throughout the travel. As the magazine is unloaded, the coil will wind back up, causing the follower to rise.

How is it the wrong type of spring? It's just like the one Boltsniper described in his FAR.

I like this design. It's very similar to a Nelson type valve (if any of you know what that is). In fact, it's similar to the one I'm designing now. I'm interested to see it completed, though, especially how you plan on triggering it. An option (if you haven't decided already) is to use the actual bolt to open the valve.

As far as the QEV, yes these can perform well if they are set up correctly. I'd assume that since you are using this type of valve, that you are already familiar with this, so I won't go into any details on it. They are a bit less efficient than spool valves of similar size, but it should work okay if the pressure in the chamber is right, which is going to depend on it's volume and the actual function of the blaster.

Found the spring:
http://www.mcmaster....9293k42/=63u07z

This particular one will stretch up to 15", but I will probably trim it so that I can load as many darts into the magazine as possible. I will have to get one a check it out before I know just how much needs to be trimmed. It has about 1/2 pound of force, which is around the tension of the current springs.

I'm also working with the magazine to possibly make it a double stack version without having to use two magazines for just one. This is gonna be tedious this will require me to use other materials such as plexiglass and also to modify my receiver. I will also have to modify the stock, as I rather like the idea of storing a spare mag in it, but I would estimate, with the new spring, that I should be able to get about 15 rounds per mag.

My Recon is also going through a complete change in that I will be converting it to pneumatic operation and have it semi auto, so these new mags will be just the thing for it.