Love my mcx geissele - Geissele Super MCX SSA M4 Curved Bow AR Style Steel

If you follow the instructions, the MCX trigger is easy to install. It took about 15 minutes. The difference in the trigger between the original trigger and the Geissele is amazing. I used this Mcx trigger for my Sig Rattler. It now has a crisp, smooth trigger. Seriously, we are talking a judge difference.