Fits all Model 98's including Customs. Comes with X-core 8 stage Expansion Chamber, GTA vertical adapter, right length hose, elbows and lock tite. Required assembly time is estimated at 30 minutes. Note: this expansion chamber is the cool one that you've seen that goes into your foregrip Choice of color on the Expansion Chamber Black, Blue, Green, Silver, Red. Please let us know if you have a drop forward so we can get you the correct size hose.