greer, you can convert the one that you have to a really nice two stage for less than $100.00. Neal Stepp the owner of ISS in Fort Worth, TX will sell you the part you need to change. Nomad helped me with mine and I was very satisfied with the change. His phone number is 817 595 2090
You can also talk to him about the LOP trigger, I believe he sells them for around $200.00