Tuning The NPAS On The APFG Spear LT
OptimusPrime
02 Jan 2026
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."