Complements the XPS/EXPS well. With the reduced footprint of the XPS and this magnifier you can comfortably fit the Holographic sight, Magnifier, and BUIS all on top of a standard AR A4 upper receiver rail without anything hanging off the edge. Comes with a spacer for the correct height alignment with an EXPS. Magnifier can be set up to switch to the right or left hand side. Switch mechanism locks firmly in and out of position. No worries about accidentally flipping back. One bit of warning however; If you are using a Matech BUIS it is not compatible the G33 when set up to switch to the ejection port side. The G33 release lever collides with the elevation adjustment knob on the left side. This holds true for any BUIS with a large knob or nut protruding from the left hand side. My solution was to ditch the Matech BUIS and go with a KAC 600m which has no clearance issues.
Pros: Small and light, sturdy switching mechanism positively engages when switching to side
Cons: Not compatible with all folding Back up Sights
This review was written in the old system and had content requirements that are different than reviews written today.