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I finally got out to a field and tested this thing and it actually works!
Here's a short demo video. This field had no chrono so I wasn't able to fine-tune the pressures, but roughly tuned it by feel and it seems to currently be around 200-250 FPS. I have air and paint now and a chrono at home so I'll see where the pressures end up after tuning.
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Poke poke…Comment
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The shots in that video turned out to be ~230 fps or so. After bumping up the pressures, I ran into an issue where a bumper or other oring kept getting dislodged and leaving the bolt protruding too far. After adding a stiffer bumper and then shortening the bolt to compensate, it starting chopping paint. I think I'll have to draw up a new bolt and ram to make this work. I originally used a modified Resurrection/Sniper bolt and worked around the port hole location there, but that compromised some other dimensions. It doesn't help that I tried to turn the ram from relatively large stock without relieving internal stresses and it came out slightly bent.
Oh, also the HPR is overpressurizing and I plan to redesign those internals to use a standard schrader valve or oring seat. And the ASA macroline fitting started leaking and turns out to not be a standard spec, so swapping the internal oring doesn't seem to affect the leak.
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I’m interested in your LPR thumb screw. Do you have the ability to produce more of these?Comment
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1) yes, I can make more but it's a lot of effort on a manual lathe meaning it'd be expensive and possibly not worth it.
2) I actually made a new version with a glued-in set screw instead.
3) so this thumbscrew-type one is sitting unused if you want to buy it. I have to double-check to see if I have all the parts for it. I vaguely remember making a spring seat/spacer for this and don't remember if I used it for my V2.
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