ZWQ S400 Priming Block Replacement

A cracked or broken priming block is one of the more common failure points on a well-used ZWQ S400, and this replacement shell is a direct 1-to-1 fit for the original part — no modification needed to install it. If your S400's priming block has given out, this puts you back in action without hunting down a whole new blaster.

You don't need to replace your bearings either: this replacement is designed to keep using the original bearings from your existing priming block, so you only need to transfer them over rather than buy new ones. The set includes a pack of 6 screws to secure the priming block back together once it's assembled. A cheap, practical fix for anyone whose S400 has taken a hard knock.