Using The MHA Custom Universal Stoning Fixture

A flexible tool to aid the gunsmith in correctly honing hammer, trigger and sear engagement surfaces

by Steve Adelmann


Cleaning up a firearm’s sear engagement surfaces requires careful attention in order to avoid damaging or changing critical angles. While a jeweler’s visor, good lighting and high-quality stones are vital tools for the job, relying on steady hands alone for proper alignment can lead to excessive metal removal and/or surfaces that have been stoned unevenly or at incorrect angles. The result may be a trigger is no better than before you began or, even worse, inadequate sear engagement and an unsafe firearm. Having a fixture that presents the engagement surfaces in parallel alignment to their pin bores for stoning and polishing is a helpful way to prevent these problems. The result is a savings of time, effort and the potential cost of replacement parts.

Read more in our May2011 issue. Back issues are available.

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