Righty, 426 coil U-Turns are about the heaviest in the Pike range, they’ve got a steel steerer tube in addition to the coil spring.
However, don’t let that put you off, they’re the Pike of choice for most people given that they’re reputedly the stiffest of the range and also the plushest. I’ve a set of coil 409s on one of my bikes (as per the 426, but with allen key threshold adjustment) and I rate them very highly. They’re incredibly reliable too.
I’ve a set of 454 Air U-Turns (alloy steerer, air sprung) and a set of 426 Air U-Turns (steel steerer, air sprung) and they’re all easy to look after. In many respects I prefer them to the Revelation Race forks I’ve fitted to my long travel XC bike.