DIY HPA build update: killed the Joule Creep, shrank it ~40%, and it drops into a V2 gearbox

After 115 revisions, I think I finally cracked the two biggest problems with the D8PA, my homemade HPA engine: the Joule Creep and the size.

The Joule Creep used to be so bad that the only way to run it was as a DMR / sniper. There was no playing it as an assault rifle. This new version fixes that.

**What changed in V1.1.5:**

- **Joule Creep solved.** It is now consistent enough to run as an assault, not just a marksman build.
- **Roughly 40% smaller.** It went from a hand-span of hardware to something that drops straight into a standard **Gearbox V2** shell.
- **New valve setup:** a modified commercial **QEV** (quick exhaust valve) plus updated solenoids. The QEV pushes the air down the barrel much faster.
- **Fully DIY:** printed on an FDM printer, with very few tools, built at home from parts anyone can source.

**Performance (my own chrono + air tests vs a Polar Star Fusion F2):**

- ~**72%** of the F2's air efficiency
- ~**97%** of its shot performance (as a DMR)

The simplest proof I can show is moving the nozzle backwards, which is what let me miniaturize the whole system this much.

**Files:** the **V1 files are free and already available.** This V1.1.5 is the direction the project is heading, the next gen that fits a V2.

Still a ton of work left (rewiring the FCU, cleaning up the loom, more chrono testing as an assault build), but I wanted to share where it is at. Happy to answer questions about the valve setup, the print, or the numbers.

https://reddit.com/link/1ugipep/video/yhik4znwwo9h1/player