The Emag/Xmag valve is identical to the RT/RTP/X valve(see About the RT/RTP Valve) with a different logo engraved on the outside. The valve does however require a different on/off pin length(.712") (Sear tolerance for Emag/Xmag - trigger rod 2.125", plunger rod 3.008") and a special o'ring in the on/off assembly called the "Quad o'ring". The Quad o'ring(pictured below) is seamless in the center and is used to reduce drag on the on/off pin that caused hang-ups with the standard o'ring that has a seam in the center. The drag was caused by the added weight of the sear over the RT/RTP sear.
**The ULE Trigger Pull Kit is NOT recommended for the Emag or Xmag.
Quad O'ring