The Pro-Shot 37–40mm Grenade Launcher Bronze Bore Brush (Model: 37GLBR) is a heavy-bore cleaning implement engineered specifically for maintaining 37mm and 40mm launcher barrels. Built to scrub out stubborn powder residue, carbon fouling, and plastic wad or payload buildup, it features an oversized phosphor bronze bristle profile. The solid brass core and brass threaded coupling deliver a brass-on-brass interface that protects launcher barrel walls and rifling from steel-on-steel wear and scratching during routine maintenance.

Key Features

• Phosphor Bronze Bristles: Dense, stiff bronze bristles aggressively dislodge heavy carbon and payload residue without abrading barrel surfaces.
• Bore-Safe Brass Core: Features a solid brass core wire looped to securely hold bristles, preventing exposed sharp steel ends from marring the bore.
• Brass Threaded Coupling: Built with a heavy-bore brass coupling designed for standard launcher and shotgun rod connections, ensuring the fitting will not damage the chamber or muzzle crown.
• Solvent Compatibility: Safe for use with standard gun cleaning solvents and petroleum-based maintenance lubricants.

Product Specifications

• Brand: Pro-Shot Products
• Model Number: 37GLBR
• Compatible Bore Diameters: 37mm and 40mm launcher bores
• Bristle Material: Premium phosphor bronze
• Core Construction: Solid brass core wire
• Coupling Type: Brass threaded connector
• Operation: Manual cleaning tool (non-powered)

Who is the Proshot 37-40mm Bronze Bore Brush for?

• Law Enforcement and Military Operators — Requires a bore-safe cleaning tool engineered to strip stubborn carbon and payload residue from 40mm launcher platforms without damaging rifling, enabled by dense phosphor bronze bristles and a solid brass core.
• Licensed 37mm Flare and Less-Lethal Launcher Holders — Needs an oversized scrubbing brush to clear fouling and chemical wad buildup across 37mm launcher bores using a non-marring brass-on-brass construction.
• Museum and Ordnance Conservators — Relies on non-abrasive phosphor bronze bristles and a solid brass coupling to remove internal residue and preserve historic 37mm and 40mm ordnance barrels without degrading the underlying metal.

Less suitable for: Firearm platforms with bore diameters under 37mm, including conventional 12-gauge (~18.5mm) or 10-gauge (~19.7mm) shotguns and standard rifles or pistols; these require dedicated sub-37mm calibre-specific bore brushes.