Smith & Wesson Model 4043 Pistol Barrel 4" .40 S&W DAO Stainless Steel Used OEM Part 4043A

This is a used OEM barrel for the Smith & Wesson Model 4043 semi-automatic pistol chambered in .40 S&W. This is a genuine factory part in stainless steel construction with a 4-inch length, designed for DAO (double-action-only) operation from a third-generation Smith & Wesson pistol.

Key Features:

• Genuine Smith & Wesson factory part
• Stainless steel construction
• 4-inch barrel length
• DAO (double-action-only) configuration
• Compatible with Model 4043 .40 S&W pistols
• Used condition - fully functional OEM component
• Part Number: 4043A

Compatibility:
This barrel is designed specifically for the Smith & Wesson Model 4043, a third-generation .40 S&W pistol with double-action-only operation. The Model 4043 is a variant of the 4006 series with a DAO trigger system for consistent trigger pull on every shot. The four-digit model number indicates this is a 3rd generation pistol: the first digit (4) indicates .40 S&W caliber, the second digit (0) indicates alloy frame, and the third digit (4) indicates DAO trigger configuration. The barrel is a critical component that determines accuracy and reliability.

About the Model 4043:
The Smith & Wesson Model 4043 is a third-generation semi-automatic pistol introduced in the late 1980s/early 1990s. It features a DAO trigger system preferred by many law enforcement agencies for its consistent trigger pull and enhanced safety. The .40 S&W caliber offers a balance between 9mm capacity and .45 ACP stopping power. Parts for these third-generation pistols are becoming increasingly difficult to find.

Condition:
This is a used factory barrel removed from a Smith & Wesson Model 4043 pistol. The barrel has been inspected and is in good working condition with normal wear consistent with use. The stainless steel finish shows typical handling marks and may have some holster wear. The bore and rifling are in good condition. Used parts offer an economical solution for repairs and restorations while maintaining OEM quality and fit.

Installation:
Professional gunsmith installation is strongly recommended for proper fitting and function. Barrel installation requires proper headspace verification and fitting to ensure safe and reliable operation. Improper installation can affect safety, accuracy, and reliability. Knowledge of Smith & Wesson semi-automatic pistol mechanisms is required.