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Tuning The NPAS On The APFG Spear LT

OptimusPrime

6mm Badger Tuning The NPAS On The APFG Spear LT

6mm Badger the NPAS is installed on the  APFG Spear LT and shows how... "In this video, I give an update on my APFG Spear LT, which I recently brought to Battle Lab to play with my friend Brandon. I lent it to him, but when we chrono’d it the gun was shooting around 460 FPS on 0.25 BBs — way over the field limit!

At the time I had just installed a new VFC nozzle (from a previous video — link below), and I didn’t realize that the replacement nozzle actually had an NPAS built in. So this video is me digging in, tuning that NPAS, and testing it — with some wild chrono results in between!

What happens in this video:

  • I disassemble the Spear LT and confirm there’s an NPAS inside the nozzle.
  • I start adjusting it (counter-clockwise at first = more gas flow = higher FPS).
  • When I chrono the replica with my AceTech Chronograph, the readings spike — one shot registers 1270 FPS / 18.7 J (!). I don’t think that’s real, but it made for an insane moment on camera.
  • I continue tuning and bring it back down to a safe, consistent ~320 FPS.
  • I also install a VFC KAC MCQ Suppressor (requested by a subscriber) onto the Spear LT and show how it looks compared to my PTS Dead Air Sandman.
  • I explain the issues I’ve found with the VFC suppressor — no grub screw to lock the flash hider, no tracer threading, and no licensed trades — but it still looks pretty cool on the build.

Key takeaways & lessons:

  • The NPAS is an easy way to fine-tune gas output — but be careful; a quarter turn makes a big difference.
  • Chronographs can glitch — that 1270 FPS reading was probably a sensor error, but I kept it in for fun.
  • The final tune: ~320 FPS (0.25 BBs) and field-legal again.
  • The VFC suppressor fits fine but has some usability issues — I’ll likely switch back to the PTS Dead Air Sandman setup."

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