The Proshot .50 Cal. / 12.7mm Nylon Bristle Bore Brush (Model 50NR) is a dedicated firearm maintenance tool designed for cleaning .50 calibre barrels. Built with chemical-resistant, oversized nylon bristles, this bore brush allows for the safe application of aggressive bore cleaners, copper-removing solvents, and ammonia-based solutions without degrading the bristles or producing false-positive blue/green patch indications. Its looped brass core and brass coupling protect the bore rifling, lands, grooves, and muzzle crown from mechanical damage during routine cleaning.

Key Features

• Solvent-Resistant Nylon Fill: Densely packed nylon bristles withstand harsh copper and ammonia cleaners without breaking down or reacting with the chemicals.
• Bore Protection: Features a double-wound brass core with a looped end to eliminate sharp wire edges and prevent scratching inside the barrel or at the muzzle crown.
• Standard Thread Interface: Equipped with an industry-standard #8-32 male thread for direct compatibility with standard rifle and handgun cleaning rods.
• Oversized Bristle Design: Maintains contact with the barrel walls under pressure to efficiently lift carbon, powder fouling, and debris.

Specifications

• Calibre Compatibility: .50 Calibre / 12.7mm
• Thread Pitch: #8-32 male thread
• Core Material: Double-wound brass with looped end
• Coupler Material: Brass
• Bristle Material: Chemical-resistant nylon
• Operation: Manual firearm maintenance tool

Who is the Proshot .50 Cal. / 12.7mm Nylon Bristle Bore Brush for?

• .50 BMG rifle target shooters — requires a dedicated .50 calibre / 12.7mm bore brush that connects directly to standard #8-32 male threaded cleaning rods to scrub powder fouling while applying aggressive copper-stripping solvents without false readings.
• .50 calibre black powder muzzleloader hunters — relies on the chemical resistance of this .50 calibre / 12.7mm nylon bore brush to aggressively flush out corrosive black powder residue and bore pastes without corroding the tool.
• Large-bore handgun owners — uses the looped-end brass core on this .50 calibre / 12.7mm brush to protect the rifling and crown of .500 S&W and .50 Action Express handgun barrels during standard rod maintenance.

Less suitable for: Firearm barrels outside the .50 calibre (12.7mm) specification—where sub-.50 bores risk bristle binding and larger shotgun bores lack adequate wall contact—and barrels with severe copper jacket fouling or heavy, baked-on lead deposits, which require a dedicated .50 calibre phosphor bronze bristle brush for mechanical abrasion.