100M ZeroArm EVO – hop up arm for VFC EVO series
100M ZeroArm EVO – hop up arm for VFC EVO series
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Excellent service and an excellent product. I have installed both in my evos and the difference is evident in the consistency and accuracy.
Works great!
Hop arm is very precise and works flawlessly.
Best upgrade ever.
Why this exists?
TLDR: stable and consistent grouping compared to stock hop up arm, achieved with redesigned geometry and precise 0.02mm CNC machining.
It's recommended to replace the original screws of the EVO hop up chamber with this TORX screw set
Say by to flyers, get more consistent shots with the ZeroArm EVO for VFC EVO AR series
The ZEROArm is manufactured with high precision and was designed with very tight tolerances. The original stock arm moves back and forward – which makes the shooting inconsistent due to unstable first point of contact.
Also, the pressure area is slightly shifted – this helps with preventing overchambering, a phenomenon that is quite known to be an issue with VFC AR platform. The shift dramatically improves BB seating consistency in the chamber.
The ZeroArm EVO allows you to install omega and round nubs and keeps them centered.
- Keeps your nub centered by fitting it into the precisely milled cutout. The stock arm allows movement to the sides which is not desirable and can cause side to side inconsistencies.
- Has optimal clearance for omega nubs, applies no pressure at 0 hop.
This gives you a lot of options to fine tune the hop up performance to your needs.
Significantly helps mitigate the overchambering issue
The arm has a center pressure point shifted more towards the entrance of the bucking. This means that it focuses the pressure at the start of the bucking patch to help with the BB seating with the initial edge of the patch more consistently.
Recommended configuration
These are some combinations which gives you great results without overchambering. Personally tested (Unicorn Competition 70deg, 4UANTUM Friction PRO, Tagart and VFC Blue) at 1.3J & 1.8J
Lower limitation - minimum weight to ensure consistent hop up.
Upper limitation - maximum weight before jams can occur due to smaller diameter through which the BB cannot be pushed through or the power starts to drop significantly, requiring more gas. This can vary based on on temperature and overall power output.
With included round (hollow) soft nub (silicone 60deg)
- Unicorn Competition 70deg, 0.30g - 0.40g
- 4UANTUM Friction, 0.32g - 0.43g
- Tagart 70deg, 0.30g - 0.40g
- VFC Blue, 0.36g - 0.43g
- Waldo Crimson 65D - 0.30g - 0.36g
With included omega nub (silicone 60deg)
- Unicorn Competition 70deg, 0.36g - 0.43g
-
4UANTUM Friction, 0.40g - 0.48g
- Tagart 70deg, 0.36g - 0.43g
- VFC Blue, 0.40g - 0.48g
- Waldo Crimson 65D - 0.36g - 0.40g
Important info about the Waldo Crimson buckings when using BBs 0.40g and heavier
The Waldo Crimson bucking was NOT USED DURING DEVELOPMENT AND TESTING, information provided is based on user experience.
Due to the different geometry (smaller protrusion), you'll need do a modification or use harder nub:
- Option 1: use harder nub (80D) to effectively hop BBs 0.40g and heavier or
- Option 2: with included 60D nub, add 2 0.1mm shims inside the nub slot - this can be a small cut piece from a soda can which has thickness around 0.1mm
Fitment & precision comparison
What you get
- 1x CNC machined hop up arm made of 6061-T6
- 1x round soft silicone nub
- 1x concave 60D nub
FAQ
Which VFC models are compatible?
- VFC PDX SBR
- VFC KAC L403A1 KS-1
- VFC BCM MK2 MCMR EVO
- VFC VR16 URG-I EVO
- VFC VR16 M4A1 RIS /SOPMOD M4
- VFC/Umarex - HK416A5 M-LOK EVO AIRSOFT GBB
- MARKSMAN - MK12 Mod0 Gen2
- and ALL new VFC releases with the EVO AR hop up chamber
What BB weights was it tested with?
Testing covered 0.30 g to 0.48 g depending on nub configuration. See "Recommended configuration" above
Does it eliminate over-chambering?
The geometry is designed specifically to reduce the over-chamber issue found in the stock arm. This is achieved by manufacturing with extremely strict tolerances as well. The arm doesn't move back and forth.
I still get over-chambering issue, what now?
There are still a lot of factors that the arm itself cannot counter. Make sure your BB weight is suitable for your bucking. If using the concave (omega nub), try using the soft silicone rounded nub.
Other issues may lead to over-chambering issues as well. Such as cooldown (your bucking is too cold to stop the BB) or bolt bounce (bolt bounces heavily and pushes the BB further on rebound)
Which nubs work best?
The included nubs worked the best for me and tested buckings. Of course, feel free to experiment and share the results.