Selected Handgun Detail

Manufacturer
	Smith & Wesson More Info

About the Gun

Third generation single-stack double action semiautomatic pistol. Descendant of the first generation model 39 and second generation model 439. Exposed hammer, beveled magwell, extended squared trigger guard, one piece wrap-around grip.

Production

Production ran from 1988 through 1991.

Market value

MSRP at production was around $525. Used examples in 95% condition currently average around $470.

Cartridge Specifications
Cartridge:	9 mm Luger
Alias:	9 mm Parabellum
More Info

Analysis

The Smith & Wesson Model 3904 represents an incremental update within the long-running 39-series lineage, incorporating third-generation refinements such as improved ergonomics and controls while retaining the single-stack 8-round capacity and alloy-frame construction of its predecessors. Owners and users from forums and reviews generally describe it as reliable in function, with consistent feeding across various ammunition types when maintained, though some note that disassembly for cleaning involves more steps than simpler modern designs, which can deter infrequent users. The double-action trigger pull receives mixed feedback—often characterized as long and somewhat heavy, with a single-action pull that can feel gritty or inconsistent in some examples, potentially influencing accuracy during rapid fire or precise shooting. The pistol's slim grip profile suits a range of hand sizes better than the wider double-stack third-generation models like the 5906, contributing to its handling in both duty and off-duty contexts. Parts availability remains a consideration for older third-generation S&W autos, as certain components are no longer produced in volume, though the design's durability supports extended service life with proper care. In the broader handgun market of the late 1980s and early 1990s, it occupied a transitional role between traditional alloy-frame service pistols and the emerging preference for higher-capacity configurations, limiting its long-term adoption before discontinuation. Overall, it performs adequately as a duty or personal defense firearm in its era, with balanced observations on its mechanical traits rather than widespread reports of major flaws.