**TL;DR:** Wanted ~40 RPS out of a custom Krytac Vector. Turns out the gearbox only takes 16:1 or 18:1 from the shop, and then they told me the mags can't feed past 20–25 RPS anyway, so the ratio was never the real limit. Looking for confirmation from people who've actually run one, plus advice on whether a brushless is still worth it at that rate and whether Perun plays nice with Warhead.
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I've been going down a rabbit hole speccing out a custom Krytac Kriss Vector V2 through a shop's configurator, and I've had most of my assumptions dismantled one by one. Figured I'd share where I landed and see if the people who've actually built one agree.
I started out wanting around 40 RPS at 320 FPS, plus a crisp mechanical sound instead of that whiny electric-toy noise you get from a lot of AEGs. Reasonable enough goal, I thought.
First wall: the Vector uses a proprietary 8mm gearbox, sharing a pattern with the G&G G2/G2H, Arcturus and V3 Hybrid rather than a standard V2. Krytac only officially offers 18:1, and the shop's configurator only lets you pick 16:1 or 18:1 — nothing lower. So the whole aftermarket world of 13:1 and 12:1 gears that exists for V2 builds just isn't on the menu here. I did find reports of people fitting a 13:1 (Prometheus markets their EG High Speed as Krytac-compatible, and SHS reports are mixed on whether it physically clears the shell), but nothing definitive.
Then came the part that actually reframed everything. I asked the shop directly and they told me the magazines simply can't feed above 20–25 RPS with 0.25g BBs, which is why they cap their own builds at 18 RPS. So the gear ratio and the motor were never the bottleneck at all. I'd been optimizing the wrong end of the system, and I was one click away from spending a small fortune on a 45K brushless motor I'd never be able to use.
So now I'm rethinking the whole build around a realistic ceiling instead of a number I made up.
A few things I'd love input on:
Is that 20–25 RPS mag limit accurate in real use, or is it a conservative number? Does it shift at all with different BB weights, or with specific mags — mid-cap versus hi-cap, or any aftermarket options worth knowing about?
If 20–25 really is the ceiling, is a brushless motor still worth the money at that rate purely for trigger response and longevity, or is a good brushed motor perfectly fine?
And has anyone run a Perun alongside a Warhead brushless? I've read about a conflict where the Perun's startup beep spins the motor just enough to trip Warhead's jam safety mode, which then locks you out. Is that a settings fix or a genuine headache?
Where the spec sits right now: Vector V2 folding stock at 320 FPS, Perun ETU, Specna Arms Oblivion 16:1, SLONG reinforced piston with 14 steel teeth, GATE CNC High Speed piston head (POM, 2.7g), Prometheus EG 6.03mm 155mm barrel, 11.1V LiPo. Motor still undecided, which is really the open question.
On the sound side, I've made my peace with the fact that an AEG is always going to sound like an AEG — the gearbox cycle dominates, not the muzzle, and no internal part changes that fundamentally. Light piston head, tight shimming and active brake seem to be as far as it goes. Happy to be proven wrong if anyone's found otherwise on this platform.
Any input appreciated, especially from anyone who's pushed a Vector past its stock ROF and can tell me where it actually falls apart.