BRM's Flexible Honing, Surface Finishing, and Deburring Blog Blog

BRM's Flexible Honing, Surface Finishing, and Deburring Blog

BRM's Flexible Honing, Surface Finishing, and Deburring Blog is the place for conversation and discussion about how to solve difficult finishing problems. For over 50 years, Brush Research Manufacturing (BRM) has helped customers use brushing technology to clean, rebuild, and resurface components ranging from engine cylinders to brake rotors to flywheels to firearms. BRM's Blog on CR4 provides real-world examples of how flex hones and wire brushes work. It also evaluates related technologies and invites questions from the community.

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Firearms Maintenance: Flexible Honing and AR-15 Chamber Polishing

Posted April 07, 2014 3:28 PM by Brush Research

The AR-15 rifle is a lightweight, air-cooled, magazine-fed rifle that's actuated by gas piston technology or direct impingement. Designed originally for the U.S. military, this popular firearm features a bolt and carrier mechanism. As the carrier fills with high-pressure gas, the bolt unlocks and moves rearward to extract the empty cartridge case from the chamber. When the neck of the cartridge clears the barrel extension, a spring-loaded ejector forces the case through a port on upper receiver.

First built by ArmaLite during the 1950s, the AR-15 is now manufactured by many different firearms companies, including Colt, Bushmaster, and Stag Arms. Popular among hunters, shooters, and law enforcement agencies, this lightweight rifle is available in a variety of sizes and configurations, but made mainly of aluminum alloys. The AR-15's accuracy and weight contribute to its popularity, and gun owners often have questions about the best way to clean and polish components such as the chamber.

Gun Tools for AR-15 Maintenance

At the website for Guns Magazine, an on-line article called AR-15 Building Tools - Part II described what the author called "handy" items for firearms maintenance. The list included rear-sight spring tools, a bolt disassembly fixture, and a front takedown pin detent installer. The gunsmith also emphasized the importance of polishing AR-15 chambers to ensure that spent cartridge cases eject properly. The gun polishing tool he mentioned by name was the Flex-Hone from Brush Research Manufacturing (BRM).

Flex-Hone for Firearms tools are used to polish and surface finish rifles, shotguns, pistols, revolvers, and paint ball guns. Designed for smooth bores, BRM guns tools are ideal or any size or type chamber, cylinder, barrel, slide, or magazine tube. In the case of AR-15 chambers, the Flex-Hone for Rifles safely removes residues, machining marks, corrosion, oxidation, and surface imperfections while imparting a wear-resistant finish. BRM rifle brushes feature silicon carbide (SC) abrasive and come in overall lengths (OALs) of 6", 8" 12", and 14". The length of the abrasive part is 1-5/8".

Flexible Honing for AR-15 Rifle Chambers

Flex-Hone technology uses a low-temperature, low-pressure abrading process to produce a long wearing surface with a minimum of stock removal, ensuring that the bores of your firearms remain at the precise dimensions required. Built with a double-wire metal stem, Flex-Hone tools can be used with either handheld electric tools or machine centers. As this video shows, BRM gun tools are also easy-to-use. They're trusted by hobbyists, professional, gunsmiths, and the firearms industry alike.

Self-centering, self-aligning to the bore, and self-compensating for wear, flexible hones must be used with a good quality cutting oil or honing fluid. This helps to minimize heat, and prevents the tool from loading. In addition to removing oxidation and corrosion, flexible honing produces a plateau finish that optimizes lubrication. To impart this ideal surface finish, Flex-Hone technology also removes highly-stressed surface areas that can contribute to the formation of corrosion. Smoother surfaces also prevent plastic buildup, and support the performance of firearms such as the AR-15 rifle.

Author's Note: This CR4 blog entry originally appeared in the BRM Flex-Hone blog.

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