Steel Rifle Receiver – Automated Surface Polishing

A U.S.-based firearms manufacturer in Wyoming required improved surface finishing for steel alloy rifle receivers. The customer’s existing process relied heavily on manual polishing, limiting production throughput and producing inconsistent surface quality.

Bel Air Finishing evaluated automated finishing technologies to refine the receiver surfaces, improve polish consistency, and significantly reduce the amount of manual hand finishing required.

Bel Air Finishing evaluated multiple automated finishing methods to determine the most effective approach for improving the surface finish of the steel rifle receivers while reducing manual polishing. Following process evaluation, Bel Air developed an automated finishing workflow combining centrifugal disc finishing and horizontal drag finishing to achieve the required surface quality and production efficiency.

First, the steel rifle receivers were processed in a Centrifugal Disc Finisher, where high-energy media action refined the machined surface, reduced initial surface roughness, and pre-polished the parts prior to final polishing.

The receivers were then mounted in a Horizontal Drag Finisher, where controlled media contact produced a uniform polished finish while preserving the geometry of the receiver components.

Surface metrology measurements confirmed a significant improvement in surface finish, reducing the average roughness from Sa 18.297 µin to Sa 2.5719 µin.

By integrating high-energy finishing with precision drag finishing, Bel Air was able to eliminate approximately 90–100% of manual polishing, significantly improving production throughput and process consistency.