This is an outstanding trigger. It is basically a SSA trigger that uses a different method to retain the hammer pin, different pins, and lacks laser marking. These are amazing triggers for the money. The only thing on the market close in terms of quality at this price is the LaRue MBT-2S which if you have time to wait can be had for $135 shipped.
These are factory over runs for a contract so will come in OEM packaging not retail packaging. No instructions but there Geissele videos on youtube.
Geissele 2 Stage (G2S) Trigger