Mach Sakai does a review of the Western Arms Smith & Wesson M6904, a fixed-slide airsoft pistol from 1992. He points out its hybrid functionality, using gas for propelling BBs and electricity for blowback with recoil shock. The key features of this gas pistol include its substantial weight (938g), 20-round magazine, fixed sights, and a C-More style mount. He notes the trigger pull for its initial lightness followed by a heavier pull at the end, with measurements provided for both single and double-action.

In his performance tests, it has an effective range of about 15 meters for direct shots and up to 30 meters for angled shots, attributed to the lack of hop-up. The muzzle velocity with 0.2g BBs was around 72-73 m/s. While the dot sight had a narrow and dim field of view, and the trigger was deep and somewhat heavy during speed shooting, the overall impression of this classic Smith & Wesson airsoft pistol was positive.