The Dewey Brass Muzzle Guide for .40 caliber firearms is an essential gun cleaning accessory designed to protect your barrel's crown and rifling during maintenance.Dewey Brass Muzzle Guide .40 CaliberConstructed from durable brass materialSpecifically designed for .40 caliber firearmsProtects barrel crown and rifling during cleaningGuides cleaning rods for proper alignmentEssential for proper firearm maintenance this brass guide ensures your cleaning rod stays centered in the barrel preventing damage to the rifling and maintaining your firearm's accuracy.