is the ammo muzzle loaded and approx .25 caliber?. Looks very clean and seems like it could be loud at the right pressure.

This is very slick. If you decide to make a grip for it, leave a channel so the pilot would vent at the bottom of the handle. See Pic

I absolutely love this forum site. You guys are great. Ah and to stop the paintballs rolling down, you could just leave a strip of pipe (or something thin added after) longways across the hole, basically two holes but shaped as one providing a small " bridge" for the projectile. Doesn't limit the fl...

very nice,you could maybe use a magnet on the bolt to pull out the spent casing Funny you mention that. I was just considering using ring magnets on the casings and a smaller one on the bolt have you tried it without shells with a hopper set up ? No, but with the current setup, the paintball would ...

Thanks for the link Jacks, that will help :) How does the bolt push the cart far enough into the barrel for it to be in front of the air? Also how do you get the carts out? Nice gun, I like the idea of cartridges. The spring provides enough recoil to force the bolt and cartridge against the breech. ...

Well gang, It's been a long time since I posted a new cannon so here goes. This cannon was inspired by a number of different sniper and competition rifles, so let your imagination choose what you think it looks like. One of the things I wanted to incorporate into the project was a bolt action cartri...

Yes they fit the barrel. I use 3/4" CPVC.

Ok GGDT Was pretty close with this gun. GGDT quoted the FPS @ 812. I Chronographed an average velocity of 785-793 FPS. Now thats more like it. Although 800 FPS would be nice. I will need to get the chamber to a higher pressure.

blown back position.

GGDT calculations were not very close with this gun I chronographed the velocity at an average of 650-663 FPS. I did not take the actiion/bolt section into consideration when pluging in the numbers. It constricts the flow of air. I'm not disapointed at these results. this just tells me I need to imp...

Today I will be testing the FPS with a chronograph for both versions of the pneumatics I made. Time to see just how accurate GGDT is. I will post the results for both guns later today.

Last night when I shot it, it was more like 1.2-2 a second. When I posted my first gun GGDT quoted my FPS @ 812. I took the specs for a 1" sprinkler valve off the GGDT site. I dumbed down the specs a little. Rainbirds open slower than Watermasters. And the specs came back as 812. like I said about m...

The gas sampling cylinder is rated over 1000 PSI so no worries there. A 1" Rainbird sprinkler valve is rated up to 150 PSI. Since its air we are talking about and not water, I won't take it any higher than 135 PSI. In the future I would like to go with a metal sprinkler valve or a QEV. I don't know ...

The metalic chamber fills with air to 135 PSI, the second chamber is regulated to 60 PSI. When the cannon is fired all of the air in the first chamber is expelled propelling the paintball @ appox. 750-812 FPS. The second chamber stores up enough air to blow back the action. Since the regulator is no...

This is my second pneumatic to use a sampling cylinder. In this post I won't be talking much about the velocity, kinetic energy, and what not. If you are interested in the specs, check out my first post "Gas Sampling Cylinder PB Rifle". This cannon is similar to my other one, So most of the specs ar...