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This is the .22 caliber small pilot stop (Redding #06121) built for the 9/64" mandrel used on the Redding Case Neck Gauge and Small Flash Hole Deburring Tool. It's machined from stainless steel and ground to a precise diameter, so when you slide it into a case mouth and spin the brass, you get a true read on neck wall thickness and uniformity down to the thousandth. If you're chasing consistency in your .224 loads, this is one of those small pieces that makes the whole system work.
The clever part of this pilot stop is its profile. The inboard end is slightly undercut so it won't pick up a ding or burr at the case mouth and throw off your dial indicator. The opposite end steps down to clear the neck-shoulder junction, where a doughnut of brass can build up. That means the indicator probe is only reading the critical section of the neck wall, not noise from the ends. It's the same design Redding uses across the whole pilot stop lineup, just sized for the .22 bore.
Setup is straightforward. You drop the small end of the stop into the case mouth, run the 9/64" mandrel through it until the alignment pin seats in the flash hole, then lock it down with the set screw. The pin keeps the case centered and stops it from rocking as you rotate it under the dial indicator. Because this is the small-mandrel version, it's meant for cases with the smaller .060" flash holes, like PPC and BR brass, where the standard mandrel won't index correctly.
Worth knowing: the Redding Case Neck Gauge ships with the .22 and .30 caliber stops already, so grab this one as a spare or if you've picked up a used gauge that's missing it. It also serves as the supplied pilot for the Small Flash Hole Deburring Tool, making it a handy part to keep on the bench for any .224 case prep work.
The 06121 pilot stop is made for the small 9/64" mandrel used on the Redding Case Neck Gauge. It also comes supplied as the standard pilot for Redding's Small Flash Hole Deburring Tool. It's the .224 caliber size, so it works with .22 cal brass.
This 06121 is the small version built for the 9/64" mandrel and cases with the smaller .060" flash holes, like PPC and BR brass. The 06122 is the same .22 caliber but sized for the larger 3/16" mandrel and standard .080" flash holes. Make sure you match the stop to the mandrel your gauge is set up with.
The undercut profile keeps the stop from contacting imperfections at the case mouth and the neck-shoulder junction. That lets the dial indicator read only the meaningful part of the neck wall, giving you smoother, more accurate measurements. It's a small design detail that makes a real difference in your readings.
Yes, the Case Neck Gauge ships with the .22 and .30 caliber pilot stops included. This one is a good buy as a replacement or spare, or if you bought a used gauge that was missing its .22 stop. To measure other calibers, you'd pick up the matching pilot stop separately.
| UPC | 611760061219 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 06121 |
| Caliber/Gauge | .22 Caliber |
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