Reality check time. If you get 900 fps on co2, you'll be the first to do so. Some have claimed 800fps, but their claims remain unsubstantiated as far as I know. Have done mid 700's so figure the 800 claims are at least possible. Dream crusher :lol: I thought it was a bit odd that CO2 yielded such a...

Sorry for taking so long to respond, I've had a while to play with GGDT and some ideas. I was going to make my own QEV to handle higher pressures, along with this I plan to operate it off of a 20 oz CO2 cylinder (I've got at least three lying around along with an ASA fill adapter, to adapt the threa...

I'll have to play with ggdt some, 500fps isn't bad but it doesn't quite rival some commercial pcps and springers.
Dumb question, how do you find flow coefficient? I've got an idea but I don't know that's it's right

I was planning on finding some blank airgun barrel or perhaps a replacement one for better accuracy, along with some actual pellets (not made incompetently by me). And what would you consider modest pressure?

Sorry for all the stupid questions, but I don't know who else to ask. I was looking to get an air rifle a while back for target shooting in my yard (longest line of sight is 75 yards) but I couldn't find an airgun that I liked that wasn't several hundred dollars. So I figured I would make my own :P ...

Maybe the smart people on this site could provide me with some insight. I ordered a 0-400 psi gauge off amazon from winters but they sent me some 4 inch 0-15 psi gauge that I haven't been able to find anywhere. I only bought it for 5$ (price jumped to 30 the next day). But I already got a Kodiak 0-1...

Ha
The video was appreciated

Thanks! I was hoping to find something for decently cheap but I guess I'll have to start saving up a little

Firstly, sorry for the stupid question :oops: I've been looking around for a little while for a pressure regulator for a co2 setup, output pressure being from 0-500 or 100-500 or something like that (doesn't have to be exactly 500, maybe 450 or something). Ive looked through Amazon a couple of times...

Dear god I'm stupid, thanks!

A little late but very nice! A question if I may, it seems pretty consistent that the orafice for the pilot vent is somewhat small. Is there any harm in using a larger port? I was planning on using a 1 1/4" nipple (1.4" inner diameter), but I wasn't sure if it would be too large. The only problem fo...

I've been thinking of using a hockey puck for the sealing face (or at least part of one)

Very nice, looks like it's coming quite well. I have to say I quite like what you did with the piston. A few questions if I may, what does the inside of your piston housing look like? I can't a length of pipe that isn't welded. And I think you may want to use some thicker washers, depending on how h...

Quick and stupid question, I'm planning on making a piston valved hybris with custom made aluminum cylinders (two to hold the o-rings and one to back up the sealing face). I can't figure out quite how thick to make them. So far I've thought of making them 1/2" thick each (2" diameter), but I think i...

Hiya, it's kind of funny but I'm about in the same boat as you. I've been planning a piston valve hybrid similar in scale since August or so, although I think I've got everything pretty much figured out. Anyhow, idk if you've heard of HGDT but it's very helpful for designing hybrids (it's a computer...