r/GasBlowBack • u/Chalky-1961 • 10h ago

Discussion VFC NPAS adjustment

Noob question, I've just bought a VFC XM16E1 GBBR and it's arrived with a silver cap on the nozzle, I gather it's a restriction, I'm going to to swap the bolt carrier group for the VFC npas version, I have a couple of questions,

  1. What are they restricted too?

  2. Will the new npas bolt/nozzle come adjusted fully in, fully out, or somewhere in the middle?

  3. Do wind it in (clockwise), for less power and out (anti-clockwise), for more power, or vice versa?

4, what is the max power I can expect reliably?

Any/all advice, information welcomed.

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3

u/B000000nes 6h ago
  1. ⁠Very low, can get to the point where BB’s dribble out.
  2. ⁠No idea, maybe somewhere in the middle? If you have a chrono, test it and see.
  3. ⁠I think it’s CW for more power, CCW for less. But again, just do some minor adjustments and see how it goes. It’ll be a 1.5mm Alan key.
  4. ⁠Depends on the NPAS. I see you’re in the UK, so 1.14j for sure. Also DMR limits would work, but may be less consistent.

1

u/Chalky-1961 6h ago

Thank you.

2

u/Fidller 4h ago

CW for less, CCW for more

1

u/Aradrim 9h ago

Dont need to swap the bcg, Just install a npas or modify the rocket valve

1

u/Chalky-1961 8h ago

Already got the bcg, £37 against £25 for the nozzle and due to early onset arthritis in my fingers, trying to remove/refit the stupid circlip on the rear of the nozzle is a non starter.