Redding 6mm Small Stainless Pilot Stop 9/64″ Mandrel 06123

Description

This is the small-mandrel version of Redding's 6mm pilot stop, part number 06123, built specifically for the 9/64" mandrel rather than the standard 3/16" size. If you're running small flash hole 6mm brass, this is the piece that lets your Redding Case Neck Gauge actually do its job. It's machined from stainless steel on CNC equipment, so the fit and finish are consistent from one piece to the next.

The real trick here is the shape. Redding slightly undercut the pilot so it won't catch on little imperfections at the case mouth or where the neck meets the shoulder. That matters more than it sounds, because a pilot that hangs up on those spots throws off your dial indicator and gives you readings you can't trust. The undercut keeps things riding smooth so you get clean, repeatable numbers every time you sort brass.

Why the 6mm Small Pilot Stop Uses the 9/64" Mandrel

There are two 6mm pilots in the Redding lineup, and the difference comes down to flash hole size. This one is made for the small 9/64" mandrel, which is what you want for tight, small flash hole cases like 6mm BR and 6mm PPC. Shooters loading 6mm Creedmoor or 6mm Dasher with small flash hole brass reach for this one too. If your cases use the larger flash hole, you'd want the 3/16" version (06124) instead, so check your brass before you order.

Putting the 6mm Stainless Pilot Stop to Work

This pilot stop pairs with the Redding Case Neck Gauge for measuring neck wall thickness and sorting brass by uniformity, and it also fits the small-mandrel Flash Hole Deburring Tool. A pilot stop is required for each caliber you measure, so if you're expanding into 6mm precision work, this is a must-have addition to the kit. It's a simple, mechanical piece with no moving parts to wear out, and the stainless build means it'll hold up through plenty of loading sessions.