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The following is for informational purposes only, i take no responsibility for what you do with this knowledge. i can not be held responsible for any property or medical damages caused by this weapon. i would advise you to check your local laws. These types of guns are illegal in some areas, and i would highly advise you against building one of these in said areas. Pneumatic rifles can be very powerful and should never be pointed at a person or animal. Lastly when dealing with pneumatics never over pressurize them and always use NFS-PW pipe (as apposed to DWV)-PVC can only be used at half or less than half the pressure rating stamped on the pipe when pressurized gases are used in the pipe-i would suggest never pressurizing this cannon above 150 psi, remember its only plastic-never store any type of PVC pneumatic with pressure still in it-always allow a full 24hours for PVC glue to dry before pressurizing-when building pneumatics always use metal or PVC pipe (never ABS)-PVC is shock sensitive meaning if its dropped on a hard its very likely it will be damaged and it would be very dangerous to pressurize after damaged-PVC becomes very brittle below 32 degrees (Fahrenheit) and is very likely to explode if pressured in such conditions-when building pneumatics pressure rated pipe should always be used (none of that cell core or DWV crap)-the most important part of any pneumatic are the PVC welds AND I HIGHLY SUGGEST YOU READ THIS TUTORIAL before you even think about starting this.-when you are dealing with high velocity projectiles always remember you safety glasses-always be sure of your back stop when shooting any form of rifle, pistol, gun, bow.... anything that can fire some vague form of projectile-and use common sense!-do not use un-regulated HPA or CO2 in a PVC cannon ever they are stored at to high of pressures to be safe in PVC, but if you have a properly regulated setup they can be used ( if you lower the pressure to about 100psi)this is my entry for the launch it challenge, it is a 25MM Pneumatic Cannon. it has 2.5 foot long one inch diameter barrel with a custom bolt action mechinism, of course we have the 3-9X40 sniper scope, and a 1" modified sprinkler valve as the primary firing valve.remember always wear safety goggles, you never know where or when something will ricochet especially when its traveling at 300+FPSFun Fact: PVC shards can't be picked up by X-Rays (this is a safety tip! don't rush or you'll get a PVC shard in you and you probably wont get it out. im not saying you should sneak one of these into your luggage and go threw airport security. it would be way to big any way)power source------------------compressed airpower source pressure-----100psichamber volume--------------45 ci (approx.)barrel volume------------------25 ci (approx.)c/b ratio--------------------------1.8 to 1(approx.)firing valve----------------------pneumatically actuated sprinkler valve (a "modded sprinkler" valve)pilot valve-----------------------blow gun valvefill valve--------------------------female quick disconnectfire rate--------------------------single shot, bolt actioncaliber---------------------------25MM ( one inch)projectile velocity-------------unknown (coming soon)effective range----------------unknown (coming soon)maximum range-------------unknown (coming soon)optics---------------------------3-9X40MM rifle scopeprimary material used------PVC pipeI WOULD SUGGEST YOU DO SOME RESEARCH BEFORE UNDER TAKING THIS PROJECT, LOOK INTO THE DIFFERENT TYPES OF PIPE AND THERE RATINGS, HOW TO SOLVENT WELD PVC (THIS IS A MUST), HOW TO PROPERLY DRILL AND THREAD HOLES FOR FITTINGS, THE TYPE OF CONDITIONS PVC CAN BE USED AND STORED IN. THE MAJORITY OF THIS INFORMATION IS CONTAINED WITHIN THIS INSTRUCTABLE BUT IT IS BECOMING CLEAR THAT MANY OF YOU ARE NOT READING ALL OF IT. I HAVE ONE FINAL SUGGESTION BUILT A BASIC PNEUMATIC OR COMBUSTION FIRST IF A BASIC CANNON FAILS IT WILL BE LESS DANGEROUSPS - DON'T ATTEMPT THIS AT ALL IF YOU HAVE NO COMMON SENSE OR A LOW IQ