Yeah it's pretty cool, right? Glad you got one. Don't shoot your eye out!

lol at the 6 year later reply. Haha.

Are you injecting fuel and air that's already been mixed? If so, that means you have to store the mixed gas in a separate container which is very risky. A static electric spark could cause the container to explode. It's better to add the fuel first and then add air separately. This way, the fuel sta...

I almost blew my head off one time. I never considered the risk of it and no one ever mentioned it, but one day I walked out to the firing line to shoot a pistol and forgot to put my ear muffs on. So, I put them on with a LOADED PISTOL in my hand. I basically pointed a loaded gun at my own head whil...

I'm pretty sure Larda holds the record for highest mix, at least the "public" record. 190X was totally insane.

Don't beat yourself up over it. Bad things happen. That's why we try to be careful, but bad things still happen sometimes. We all have our stories and experiences. You shouldn't feel shame for what happened. It was an accident. They happen. Maybe try lead pellets instead? Steel tends to be pretty bo...

Get crackin! Feed us pics and vids.

I think this design is pretty unique because it involves some mechanical parts for the piston to function. It will be interesting to see how well it works.

That's a great response from the ATF. I don't understand and never will why some countries treat spud guns as if they were literal nuclear weapons and the people who build them as if they were literally a dangerous and violent war lord in need of immediate imprisonment. It baffles me why any governm...

Funny you should mention that, after doing some more thinking and pricing, I've ended up back at a Hybrid design. Would you happen to have a link to Larda's thread on his? I find it difficult to find individual threads on phpBB based forums. Here you go: https://spudfiles.com/viewtopic.php?f=28&t=1...

It looks cool. Good work! Let's see how it performs. You haven't tested it yet I assume? I say just finish it and test it. I made an oxy-propane cannon with ball detents to keep the piston closed, and it did work, but there was no real pressure in the chamber prior to ignition. I imagine ball detent...

How much pressure are you going for? What will you be shooting out of it and what velocity are you going for? If the answer is "maximum power to shoot a bullet-like thing", then there's really only one formula I can think of that makes sense: 4140 (or similar strength alloy), burst disc, big bottles...

I'm not familiar with these as I'm more of a potato/soda can launching kind of guy myself. However, after watching Larda's videos of his shooting, might I suggest just buying a bolt action target rifle instead? :lol: Jokes aside, I haven't seen Larda in forever and I don't think anyone else around h...

Excellent work! I don't think I've ever seen a breech-loading piston pneumatic before. That's pretty unique for a cannon of this size. That's awesome that you pulled that off. Well done. Regarding your metered propane cannon, I wonder what went wrong there? They are notorious for being consistent, p...

Those parts look super clean. Nicely done! Smooth as a baby's arse.