VFC SCAR L firing 2 bb's at the same time

[kar120c]

My second hand VFC SCAR L has a boring issue. often, in semi auto fires two bb's at time.
I inspected the hop up unit, taking it down for cleaning but it seems be ok, maybe a too much soft rubber.
Ther issue is less evident with high hop setting.
Anyone has a solution for this issue?

[venture]

Did you take the hopup apart and reassemble it? Sometimes the hopup bucking is stretched in there. Also, inspect bucking for tears.

[Spike]

Shooting 2 BBs per shot, or is it cycling twice?

Double feeding is usually the fault of the hop up bucking.

[kar120c]

Originally Posted by Spike

Shooting 2 BBs per shot, or is it cycling twice?

Double feeding is usually the fault of the hop up bucking.

Two each shot

[kar120c]

Do you confirm me that is a Hop Up issue?

[RainyEyes]

vfc uses a proprietary nozzle that's longer than normal v2 gearbox nozzles. Since it's second hand check that it wasn't replaced with a non-proprietary nozzle that is pushing 2 bb's at once into the hopup chamber.

[kar120c]

Originally Posted by RainyEyes

vfc uses a proprietary nozzle that's longer than normal v2 gearbox nozzles. Since it's second hand check that it wasn't replaced with a non-proprietary nozzle that is pushing 2 bb's at once into the hopup chamber.

What upgraded bucking should I use in place of the VFC stock one to have better result?

[Danke]

Guarder clear, or Systema worked for me.

Don't wind on to much hop and don't use a hard nub or one of the spool type ones.