Thanks
@Leo Greer that's a very useful review of the Novris and Krytacs. Probably better off with the Specna over either of them then?
Specna has changed manufacturers around over the years, and unfortunately I’ve never had my hands on any of them. From personal experience contrasted with what I’ve heard, Novi/Krytac perform better more consistently. Are they bad gnus? That seems to depend on the model/OEM, and that I don’t know anything about.
It is worth noting that Specna/Novi are quite a bit cheaper than Krytac, which ups my recommendation significantly for either.
I thought the Krytac squeak was primarily down to the motor, not the gears? Can you just replace the stock gears (I understand they're proprietary?) with aftermarket ones or have they implemented some fuckery where it isn't that simple? I don't want to pay Prommy/Laylax £70+ for some 13:1 gears.
I've also read that the Krytac motors are a slightly different length/size than "standard" motors which makes it difficult to change but as usual the internet is full of conflicting info.
I've been on the fence about doing work to mine or selling it on but I love the aesthetic of the 'wirecutter' handguard.
The squeak is related to the height of the bevel gear in relation to the pinion. The spur gear is pushed upwards by the upraised edges of the bearing hole, which increases bevel height, and causes the sound. This is evident even on extremely high end Krytac builds using extremely nice motors. (I’ve personally tried Tienly, ASG, ZCI, Lonex, etc, and other assorted pinions transplanted onto various motors.
I was able to fix the issue by filing the lips of the bearing hole to lower the spur gear by a large amount. The issue then was that the shaft of the spur gear was too long and pressed on the gear for the dual selector, so then more dremel work.
It’s not easy to replace the stock set because of classic fitment issues. The Prommy set does work, but from what I’ve heard they’re not good quality (I don’t have personal experience), The original Krytac set are extremely durable (much better than SHS).
If you want to increase the speed, I would highly recommend picking up a quality 40K-35K motor, such as Tienly, the ASG Boost 30K (actually 35K), or simply ordering one from ChiHai.
As far as I know, the motors are the same size as ordinary long shaft motors, but if not you can simply adjust the motor height, so the minute differences in shaft length should be irrelevant. I’m actually away from home for a while, so I can’t measure mine for you, but if you’d like I can ask around and find more info on the Prommy sets and Krytac shaft length.