I am going to try to make one. Just a fitting that is plugged then I will make a small hole in the plug. How big should the hole be? Hmm, I have no idea how small the hole should be. If you're set on making your own, I'd say start really small, try it, and then enlarge it based on trial and error. ...

I've been looking forward to seeing the gun work, looks great! I like the simplicity of the gun. Props on using the tightbore barrel, that's something I've been wanting to do myself. Have you thought about adding a needle valve to control the airflow? I find that it takes some of the guesswork out o...

The best way to limit the rpm would be to add some kind of detent, you can look at one of JSR's impressive detent projects for reference (someone else will have to provide links, or use the search), or if you want a simpler (but less adjustable) detent method, check out my bbmg . I used a simple win...

Cool video, I was somehow mesmerized. I want one. I look forward to seeing this project completed.

Thanks, I look forward to seeing yours. The barrel is 1/4" brass tubing, McMaster part #8950K533. I'm pretty happy with it, it's way more accurate than 1/4" brakeline, but loose enough to keep bb's from jamming in the barrel. It does need to be sleeved however to keep it from bending. I've been supe...

The diameter of the tube should be around 13mm (it's 1/2" brass pipe), I made it that large in hopes of avoiding the jamming problem altogether, but do you think it's still worth trying to sleeve it down? Hmmm...

JSR, the jamming usually results in the gun just spewing air, making me think it's not the hose that's the problem, but who knows maybe I'll try shortening it anyway. I suspect the jamming is caused by all the bb's clustering around the outlet and sort of jamming themselves together, making it impos...

Hi everyone, this is a project I've been working on for a while, on and off. It's a really simple concept, it's essentially a ball-detent type bbmg except I used windshield washer hose as the "valve." The hose is extremely easy to work with, and reliably holds bb's to about 100 psi before letting go...

What I was thinking was that the force (from the incoming air) behind the piston is pushing the piston forwards onto the barrel, and because the barrel limits the surface area on that side of the piston, the air pressure from behind is greater than from the other side, causing the piston to be squas...

It seems to me like the only thing that could by making the solid hot glue piston harder to actuate would be the friction the hot glue makes against its housing. Even with grease, I've noticed that hot glue is much stickier than other materials. Also, the pressure on the hot glue could be causing it...

How about a compression fitting? What I did on my bb gun is I drilled out the stop on a 1/4" compression fitting and slid the brakeline through that into the tee, from the inside so the factory made lip on the end could be used as the sealing area. I found a 1/4" compression fitting with 1/2" npt th...

Have you thought about using shells? I know that adds some complexity, but it would eliminate the problems associated with nerf darts bending or jamming. Also shell ejection looks awesome. Here's a design I have used (with a pneumatic ram instead of blow-forward) that was created by another member. ...

Hmmm, I hadn't thought about that. Shooting larger pellets would be cool, but wouldn't that mean scrapping the bbmg concept and using a valve? I don't wanna hijack Demon's thread though, so maybe discussion of this should occur elsewhere (or it seems to already have happened). On the original topic,...

Is there any reason why an o-ring or rubber tube breech wouldn't work to slow the rate of fire and increase the power? I've made a bbmg with a tube breech that runs on very little air (compared to a normal bbmg) at 100 psi, and it will shoot about 2 rounds per second at it's slowest. Even shooting t...

Just from what you've written, I would say the major issue is the fit of your piston inside the tee, the piston should fit snugly, while still being able to slide when pushed with a finger. There could be other problems as well, if possible some pictures of your valve and piston would help us figure...