SKU: DARRS4.500-1-8
MPN: RS4.500 1-8
The Repair Cylinder Sleeve 4.494 Bore 4.750 OD is a precision-engineered component designed for firearms requiring barrel restoration or replacement after wear, erosion, or damage. Manufactured by Darton Sleeves—the industry standard for custom cylinder and barrel solutions—this sleeve serves armorers, gunsmiths, and military/law enforcement facilities tasked with extending the service life of mission-critical firearms. When a barrel's bore degrades below acceptable tolerances, a repair sleeve restores function and accuracy without replacing the entire firearm assembly, making it a cost-effective solution for fleet maintenance in field operations.
This repair cylinder sleeve features a 4.494-inch bore and 4.750-inch outside diameter, precision-machined to exacting specifications that ensure reliable headspace and concentricity. The design allows for seamless installation into damaged cylinder bores, restoring original dimensions and ensuring proper ammunition seating and extraction. Darton's manufacturing process yields tight tolerances and consistent wall thickness, critical factors in preventing gas leakage, maintaining structural integrity under firing stress, and preserving the original firearm's ergonomics and sighting systems. The 4.19-pound weight and compact dimensions (5.4 x 5.35 x 9.75 inches) make field transport and bench work manageable for armory personnel.
This component is essential for tactical units, military armorers, and law enforcement agencies operating under strict budget constraints while maintaining weapon reliability. Installation requires professional gunsmithing expertise—improper fitment or drilling can compromise safety and accuracy. The repair cylinder sleeve is compatible with standard gunsmithing tools and chamber reamers, making it ideal for in-house restoration programs that reduce downtime and dependency on manufacturer servicing. Verify bore diameter and OD specifications against your specific firearm platform before ordering to ensure proper fit and function.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
