Trigger mpx - Wilson Combat AR-15 Tactical Trigger Unit

This fits in a Sig MPX Gen2. I have not tried it yet (only tested the safety), but it is a few ounces over 4lbs on my scale using a Tipton cap in the chamber. The mainspring looks crooked or off but WilsonCombat said this is by design so dont try to bend it! One may have to put in the bottom pin first then wiggle the top pin. There are two very small springs at the base of the unit, they can be pressed down hard to help with the 2nd pin. The feel of this trigger is very high quality.