Watch this first

I stripped the rubber off and soldered to a NPT fitting, or you can buy them

There is a downloadable PDF for it

https://odysee.com/@INMC:d/proof:e9

I like both of them, I would like to see exactly how that airsoft works, 477 fps on the chrono seems ok to me for what is.
OK, so apparently it's a 0.25 steel BB gun.

Running at upto 600fps @150psi, stainless steel barrel and chamber, 1/2" pilot air valve triggered by miniature 3/2 button valve, all hand made except the scope, PVC pipe for muzzle break. 7 shot gravity fed magazine tube, single shot bolt action.

I like it, what's the magazine capacity ? That's why I made my vortex hold 2000 bb's

I use those little button valves for triggers as well to power air pilot valves.

I'd go with an old fire extinguisher if size is not an issue, I have one on my full auto vortex, I think it is rated for 450psi and there is a nice brass block on top to get a fitting in

Interesting that DWV which has no actual pressure rating is better at using for pressure applications than PVC which actually has a pressure rating but is not actually rated for gas pressure.

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Yes. Still working it out, but 100 was WAY too much... Would have cleared a six story building with room to spare.

... Home depot was out of pvc.
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Good job, PVC is not rated for gas pressure.

OSS Grease Gun ?

OSS Grease Gun look

Is that ABS ? what psi do you run in it ?

Single shot or semi auto ?

Added the vertical grip (drill handle) and the double flip mags, it just comes with one mag.