http://www.instructables.com/id/shotgun ... c_weapons/

Google next time its actually easier to do then asking for help.

This will give you and idea.If scaled up a little it would be like a shotgun more then a grenade but it should have the same effect.
http://www.instructables.com/id/SGGQVJKFJNEIZRC/

you can use something like theses or you can by a scope mount at wal-mart for 12 dollars.
http://www.artistic-license-inc.com/b2b ... plings.jpg

1 how can i make a paint grenade

water balloon,paint,turkey baster,and soap
I think you get the idea.

-How well does your bolt seal? Did you add an o-ring or something (even duct tape) to seal it?

I used o rings to make it air tight.

scope
http://www.opticsplanet.net/ncstar-compact-rifle-scope-4x20-22-air-gun-scope-blue-ring-sca420b.html
Breech loader if your interested
http://www.instructables.com/id/SSPU7XQF6B7Q5Y1/?InstructImages
Painting
http://www.pvcworkshop.com/painting.htm
Lazar site
http://www.opticsplanet.net ...

It looks good!

You should block the stock.Also its a good idea to get a scope and rifle the barrel so you can call it a sniper.

One question, how long is the barrel because you might be able to shorten it to get rid of the bend and achieve better accuracy.

Not a bad effort tape, especially for a punt. Can you show a little more detail on your breach load mech...?

I got the idea off of this instructable.
http://www.instructables.com/id/SSPU7XQF6B7Q5Y1/?InstructImages The only thing i did differently is scale down to a 1/2 in. barrel sleeved in a 1 ...

First the reason behind the name and then the spec`s.I have been planing on building a piston valve for my next cannon for about a week and when i finally built it i was severely disappointed when the hot glue kept on grabbing the 1 in. pipe.since i didn't want my investment to go to waste i scraped ...

Im just putting some final touches to my air cannon and i wanted to ask how heavy should a piston be?The reason i ask is because im using a socket and even though it slides freely in an out when using my breath i didnt want to take the chance of screwing up.

Some detail:It is the same diameter as ...

Thanks for your help,Im thinking of a better design for a stock or i might just give it a handle.

Ive been planning on making this air cannon over the weekend and keep on contemplating weather or not to block off my stock or keep it as is.will blocking the stock hurt or better the cannons effectiveness?
Thanks for your help

That's a great looking gun and what gauge of wire did you use to make the chain mail.

http://www.youtube.com/watch?v=OkoQ8WbJAVA well it works well for them apparently
They never said it wouldn't work they just said that you shouldn't use it because the gas can instantaneously explode under pressure or ideal temperature but if your going to take the chance then do it and stop ...

have them build snow cave its fun and teaches you how to survive cold weather.