Simply drop this into your WE / SOCOM GEAR M9 / M9A1 and screw on a silencer of 120mm or greater (not included). This steps up your inner barrel length to a 235mm precision tightbore inner barrel which will improve accuracy, range and power.
The threading on this barrel will fit 14mm CCW Silencers.
Although exact performance will vary, as a rough comparison a stock WE 1911 will clock in at about 330 fps, this barrel will push it up to at least 380 fps (at most 395 fps). This turns your M9 into a 'silenced' version with performance to nail targets at longer effective range. Broadly speaking, you can expect a 20% FPS increase when switching from a normal length barrel to this one.