• Proper BB retention — only 1–2 BBs drop on reload, not a handful
• Hose clamp to stop the Festo connector twisting and stripping threads
• Strong ejection pin (option to add a second loose spring for extra kick)
• Swappable shell latches (2.4 / 2.6 / 2.8 / 3.0 mm) — fit different shell heights with minimal sanding

• SLA printer required (no FDM workaround)
• Common hand tools and parts (listed below)
• Full build guide coming later — parts mostly make sense where they go

• 1 × M2 × 8mm bolt (shell opener)
• 1 × M2 × 5mm bolt (hose clamp)
• 1 × M2.5 × 16mm bolt (latch)
• 1 × Rod 2mm × 18mm (BB retention)
• 2 × Ø4.5mm springs (15–20mm length)
• 1 × Festo QSM-M7-6-I hose connector + ~10cm 6×4mm hose
• 1 × HPA connector (US or EU style)

• Printer: SLA (tested on Anycubic Photon M3)
• Resin: Anycubic flexible tough resin
• Orientation: Print angled with supports
• Critical: Manually remove any supports inside mag interfaces (threads, BB route, internal gas chamber) — these must be clean
• Exposure: ~5s on Photon M3 (adjust for your resin/printer combo)
• Post-processing: Post-cure and test-fit before final assembly

If the Festo connector has any play, add the hose clamp and a drop of threadlocker on the small threads for long game use. This prevents loosening and stripping over extended play sessions.